Portal:Cetáceos

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El Portal de los Cetáceos

P: hora central europea

Cetacea ( / s ɪ ˈ t eɪ ʃ ə / ; del latín cetus ' ballena ', del griego antiguo κῆτος ( kêtos ) ' pez enorme , monstruo marino ') es un infraorden de mamíferos acuáticos perteneciente al orden Artiodactyla que incluye ballenas , delfines y marsopas . Las características clave son su estilo de vida totalmente acuático, su forma corporal estilizada , su gran tamaño y su dieta exclusivamente carnívora . Se impulsan a través del agua con un poderoso movimiento hacia arriba y hacia abajo de su cola que termina en una aleta parecida a una paleta, usando sus extremidades anteriores en forma de aletas para maniobrar.

Si bien la mayoría de los cetáceos viven en ambientes marinos, un pequeño número reside únicamente en agua salobre o agua dulce . Al tener una distribución cosmopolita , se pueden encontrar en algunos ríos y en todos los océanos de la Tierra, y muchas especies habitan en vastas áreas donde migran con el cambio de estaciones.

Los cetáceos son famosos por su gran inteligencia, su complejo comportamiento social y el enorme tamaño de algunos de los miembros del grupo. Por ejemplo, la ballena azul alcanza una longitud máxima confirmada de 29,9 metros (98 pies) y un peso de 173 toneladas (190 toneladas cortas), lo que la convierte en el animal más grande que jamás haya existido.

Hay aproximadamente 89 especies vivas divididas en dos parvordenes : Odontoceti o ballenas dentadas (que contienen marsopas , delfines , otras ballenas depredadoras como la beluga y el cachalote , y los zifios poco comprendidos ) y los Mysticeti o ballenas barbadas que se alimentan por filtración (que incluyen especies como la ballena azul , la ballena jorobada y la ballena de Groenlandia ). A pesar de sus cuerpos altamente modificados y su estilo de vida carnívoro, la evidencia genética y fósil ubica a los cetáceos anidados dentro de los ungulados pares , más estrechamente relacionados con los hipopótamos dentro del clado Whippomorpha . ( Articulo completo... )

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Las entradas aquí constan de artículos buenos y destacados , que cumplen con un conjunto básico de altos estándares editoriales.

Imagen 1
El anatomista John Struthers (a la izquierda, con sombrero de copa) con la ballena Tay en el patio de John Woods, Dundee, 1884, fotografiado por George Washington Wilson.

La ballena Tay , conocida localmente como el Monstruo , era una ballena jorobada que nadó hasta el fiordo de Tay en el este de Escocia en 1883. Fue arponeada en una cacería, pero escapó y fue encontrada flotando muerta frente a Stonehaven una semana después. Fue remolcado a Dundee por un showman, John Woods, y exhibido en una gira en tren por Escocia e Inglaterra.

El profesor Regius de Anatomía de la Universidad de Aberdeen, John Struthers, diseccionó la ballena, la mayor parte del tiempo en público con una banda militar tocando de fondo, organizada por Woods. La ballena en descomposición le dio a Woods una gran cantidad de dinero y hizo famoso a Struthers. ( Articulo completo... )
Imagen 2

Esqueleto reconstruido en el Museo de Historia Natural de la Universidad de Pisa

Ambulocetus (Latin ambulare "to walk" + cetus "whale") is a genus of early amphibious cetacean from the Kuldana Formation in Pakistan, roughly 48 or 47 million years ago during the Early Eocene (Lutetian). It contains one species, Ambulocetus natans (Latin natans "swimming"), known solely from a near-complete skeleton. Ambulocetus is among the best-studied of Eocene cetaceans, and serves as an instrumental find in the study of cetacean evolution and their transition from land to sea, as it was the first cetacean discovered to preserve a suite of adaptations consistent with an amphibious lifestyle. Ambulocetus is classified in the group Archaeoceti—the ancient forerunners of modern cetaceans whose members span the transition from land to sea—and in the family Ambulocetidae, which includes Himalayacetus and Gandakasia (also from the Eocene of the Indian subcontinent).

Ambulocetus had a narrow, streamlined body, and a long, broad snout, with eyes positioned at the very top of its head. Because of these features, it is hypothesised to have behaved much like a crocodile, waiting near the water's surface to ambush large mammals, using its powerful jaws to clamp onto and drown or thrash prey. Additionally, its ears possessed similar traits to modern cetaceans, which are specialised for hearing and detecting certain frequencies underwater, although it is unclear if Ambulocetus also used these specialised ears for hearing underwater. They may have instead been utilised for bone conduction on land, or perhaps served no function for early cetaceans. (Full article...)
Image 3

The humpback whale (Megaptera novaeangliae) is a species of baleen whale. It is a rorqual (a member of the family Balaenopteridae) and is the only species in the genus Megaptera. Adults range in length from 14–17 m (46–56 ft) and weigh up to 40 metric tons (44 short tons). The humpback has a distinctive body shape, with long pectoral fins and tubercles on its head. It is known for breaching and other distinctive surface behaviors, making it popular with whale watchers. Males produce a complex song typically lasting 4 to 33 minutes.

Found in oceans and seas around the world, humpback whales typically migrate up to 16,000 km (9,900 mi) each year. They feed in polar waters and migrate to tropical or subtropical waters to breed and give birth. Their diet consists mostly of krill and small fish, and they use bubbles to catch prey. They are promiscuous breeders, with both sexes having multiple partners. Orcas are the main natural predators of humpback whales. (Full article...)
Image 4

Rice's whale surfacing in the Gulf of Mexico

Rice's whale (Balaenoptera ricei), also known as the Gulf of Mexico whale, is a species of baleen whale endemic to the northern Gulf of Mexico. Initially identified as a subpopulation of the Bryde's whale, genetic and skeletal studies found it to be a distinct species by 2021. In outward appearance, it is virtually identical to the Bryde's whale. Its body is streamlined and sleek, with a uniformly dark charcoal gray dorsal and pale to pinkish underside. A diagnostic feature often used by field scientists to distinguish Rice's whales from whales other than the Bryde's whale is the three prominent ridges that line the top of its head. The species can be distinguished from the Bryde's whale by the shape of the nasal bones, which have wider gaps due to a unique wrapping by the frontal bones, its unique vocal repertoire, and genetic differences.

It is a medium-sized baleen whale that grows up to 12.65 meters (41.5 ft) in length and weighs up to 13.87–27.2 metric tons (13.65–26.77 long tons; 15.29–29.98 short tons). The Rice's whale inhabits a restricted stretch along the continental slope in the northeastern part of the Gulf of Mexico between depths of 150–410 meters (490–1,350 ft) off the coast of western Florida, although some whales have been sighted in the northwestern portions and the species may have inhabited a wider distribution throughout the Gulf in historical times. It does not migrate but remains within this area year-round. Little is known about the feeding behavior of Rice's whales, but data from a tagged individual revealed a diel vertical diving pattern, in which the whale spends most of the day feeding at or near the seafloor at depths of up to 271 meters (889 ft) and night at the surface. The whale's diet remains unknown, but lanternfish and hatchetfish are suspected prey. (Full article...)
Image 5
River dolphins are a polyphyletic group of fully aquatic mammals that reside exclusively in freshwater or brackish water. They are an informal grouping of dolphins, which itself is a paraphyletic group within the infraorder Cetacea. Extant river dolphins are placed in two superfamilies, Platanistoidea and Inioidea. They comprise the families Platanistidae (the South Asian dolphins), the recently extinct Lipotidae (Yangtze river dolphin), Iniidae (the Amazonian dolphins) and Pontoporiidae. There are five extant species of river dolphins. River dolphins, alongside other cetaceans, belong to the clade Artiodactyla, with even-toed ungulates, and their closest living relatives the hippopotamuses, from which they diverged about 40 million years ago. Specific types of dolphins can be pink.

River dolphins are relatively small compared to other dolphins, having evolved to survive in warm, shallow water and strong river currents. They range in size from the 5-foot (1.5 m) long South Asian river dolphin to the 8-foot (2.4 m) and 220-pound (100 kg) Amazon river dolphin. Several species exhibit sexual dimorphism, in that the males are larger than the females. They have streamlined bodies and two limbs that are modified into flippers. River dolphins use their conical-shaped teeth and long beaks to capture fast-moving prey in murky water. They have well-developed hearing that is adapted for both air and water; they do not really rely on vision since the water they swim in is usually very muddy. Instead, they tend to rely on echolocation when hunting and navigating. These species are well-adapted to living in warm, shallow waters, and, unlike other cetaceans, have little to no blubber. (Full article...)
Image 6

Skull of Janjucetus hunderi at the Melbourne Museum

Janjucetus is an extinct genus of cetacean, and a basal baleen whale (Mysticeti), from the Late Oligocene around 25 million years ago (mya) off south-east Australia, containing one species J. hunderi. Unlike modern mysticetes, it possessed large teeth for gripping and shredding prey, and lacked baleen, and so was likely to have been a predator that captured large single prey animals rather than filter feeding. However, its teeth may have interlocked, much like those of the modern-day filter-feeding crabeater seal (Lobodon carcinophaga), which would have allowed some filter-feeding behaviour. Its hunting behaviour was probably similar to the modern-day leopard seal (Hydrurga leptonyx), probably eating large fish. Like baleen whales, Janjucetus could not echolocate; however, it did have unusually large eyes, and so probably had an acute sense of vision. The only specimen was found on the Jan Juc beach, where the remains of the extinct whales Mammalodon, Prosqualodon and Waipatia have also been discovered. (Full article...)
Image 7

The narwhal (Monodon monoceros), is a species of toothed whale, and the only member of the genus Monodon. Its closest living relative is the beluga whale, and cases of interbreeding between the two species has been recorded. It is sexually dimorphic, as adult males are larger than females and have a long single tusk that can be up to 3 m (9.8 ft). The narwhal has a mottled pigmentation, with blackish-brown markings over a white background. Instead of a dorsal fin, the narwhal possesses a shallow dorsal ridge which is thought to facilitate movement under the ice, or reduce surface area, and so heat loss. An adult narwhal is typically 3.0 to 5.5 m (9.8 to 18.0 ft) in length and 800 to 1,600 kg (1,800 to 3,500 lb) in weight. Carl Linnaeus scientifically described the species in his 1758 work Systema Naturae.

The narwhal inhabits Arctic waters, and is vulnerable to predatory attacks from polar bears, orcas and humans. Narwhals typically visit Baffin Bay between June and September. After this period, they move to the Davis Strait, a journey that spans around 1,700 km (1,100 mi), and stay there until April. Its prey mostly consists of Arctogadus glacialis, Boreogadus saida, Greenland halibut, cuttlefish, shrimp, and armhook squid. The narwhal is one of the deepest-diving marine mammals, with many individuals reaching depths of over 1,500 m (5,000 ft). Narwhals mate in the offshore pack ice in April or May, and have a gestation lasting an average of 15 months. Like most other cetaceans, the narwhal uses clicks, whistles and knocks to communicate with others of its kind. (Full article...)
Image 8

Cast of skull at the Natural History Museum of the University of Pisa

Livyatan is an extinct genus of macroraptorial sperm whale containing one known species: L. melvillei. The genus name was inspired by the biblical sea monster Leviathan, and the species name by Herman Melville, the author of the famous novel Moby-Dick about a white bull sperm whale. Herman Melville often referred to whales as "Leviathans" in his book. It is mainly known from the Pisco Formation of Peru during the Tortonian stage of the Miocene epoch, about 9.9–8.9 million years ago (mya); however, finds of isolated teeth from other locations such as Chile, Argentina, United States (California), South Africa and Australia imply that either it or a close relative survived into the Pliocene, around 5 mya, and may have had a global presence. It was a member of a group of macroraptorial sperm whales (or "raptorial sperm whales") and was probably an apex predator, preying on whales, seals and so forth. Characteristically of raptorial sperm whales, Livyatan had functional, enamel-coated teeth on the upper and lower jaws, as well as several features suitable for hunting large prey.

Livyatan's total length has been estimated to be about 13.5–17.5 m (44–57 ft), almost similar to that of the modern sperm whale (Physeter macrocephalus), making it one of the largest predators known to have existed. The teeth of Livyatan measured 36.2 cm (1.19 ft), and are the largest biting teeth of any known animal, excluding tusks. It is distinguished from the other raptorial sperm whales by the basin on the skull spanning the length of the snout. The spermaceti organ contained in that basin is thought to have been used in echolocation and communication, or for ramming prey and other sperm whales. The whale may have interacted with the large extinct shark megalodon (Otodus megalodon), competing with it for a similar food source. Its extinction was probably caused by a cooling event at the end of the Miocene period causing a reduction in food populations. The geological formation where the whale has been found has also preserved a large assemblage of marine life, such as sharks and marine mammals. (Full article...)
Image 9

Cryptolepas rhachianecti

Whale barnacles are species of acorn barnacle that belong to the family Coronulidae. They typically attach to baleen whales, and sometimes settle on toothed whales. The whale barnacles diverged from the turtle barnacles about three million years ago.

Whale barnacles passively filter food, using tentacle-like cirri, as the host swims through the water. The arrangement is generally considered commensal as it is done at no cost or benefit to the host. However, some whales may make use of the barnacles as protective armor or for inflicting more damage while fighting, which would make the relationship mutualistic where both parties benefit; alternatively, some species may just increase the drag that the host experiences while swimming, making the barnacles parasites. (Full article...)
Image 10
Atlantic white-sided dolphin caught in a drive hunt in Hvalba on the Faroe Islands being taken away with a forklift

Dolphin drive hunting, also called dolphin drive fishing, is a method of hunting dolphins and occasionally other small cetaceans by driving them together with boats, usually into a bay or onto a beach. Their escape is prevented by closing off the route to the open sea or ocean with boats and nets. Dolphins are hunted this way in several places around the world including the Solomon Islands, the Faroe Islands, Peru, and Japan, which is the most well-known practitioner of the method. In large numbers dolphins are mostly hunted for their meat; some end up in dolphinariums.

Despite the controversial nature of the hunt resulting in international criticism, and the possible health risk that the often polluted meat causes, tens of thousands of dolphins are caught in drive hunts each year. (Full article...)
Image 11

The blue whale (Balaenoptera musculus) is a marine mammal and a baleen whale. Reaching a maximum confirmed length of 29.9 meters (98 ft) and weighing up to 199 tonnes (196 long tons; 219 short tons), it is the largest animal known ever to have existed. The blue whale's long and slender body can be of various shades of greyish-blue dorsally and somewhat lighter underneath. Four subspecies are recognized: B. m. musculus in the North Atlantic and North Pacific, B. m. intermedia in the Southern Ocean, B. m. brevicauda (the pygmy blue whale) in the Indian Ocean and South Pacific Ocean, and B. m. indica in the Northern Indian Ocean. There is also a population in the waters off Chile that may constitute a fifth subspecies.

In general, blue whale populations migrate between their summer feeding areas near the poles and their winter breeding grounds near the tropics. There is also evidence of year-round residencies, and partial or age/sex-based migration. Blue whales are filter feeders; their diet consists almost exclusively of krill. They are generally solitary or gather in small groups, and have no well-defined social structure other than mother–calf bonds. The fundamental frequency for blue whale vocalizations ranges from 8 to 25 Hz and the production of vocalizations may vary by region, season, behavior, and time of day. Orcas are their only natural predators. (Full article...)
Image 12

The false killer whale (Pseudorca crassidens) is a species of oceanic dolphin that is the only extant representative of the genus Pseudorca. It is found in oceans worldwide but mainly in tropical regions. It was first described in 1846 as a species of porpoise based on a skull, which was revised when the first carcasses were observed in 1861. The name "false killer whale" comes from having a skull similar to the orca (Orcinus orca), or killer whale.

The false killer whale reaches a maximum length of 6 m (20 ft), though size can vary around the world. It is highly sociable, known to form pods of up to 50 members, and can also form pods with other dolphin species, such as the common bottlenose dolphin (Tursiops truncatus). It can form close bonds with other species, as well as have sexual interactions with them. But the false killer whale has also been known to eat other dolphins, though it typically eats squid and fish. It is a deep-diver; maximum known depth is 927.5 m (3,043 ft); maximum speed is ~ 29 km/h (18 mph). (Full article...)
Image 13

Southern right whale

Whales are a widely distributed and diverse group of fully aquatic placental marine mammals. As an informal and colloquial grouping, they correspond to large members of the infraorder Cetacea, i.e. all cetaceans apart from dolphins and porpoises. Dolphins and porpoises may be considered whales from a formal, cladistic perspective. Whales, dolphins and porpoises belong to the order Cetartiodactyla, which consists of even-toed ungulates. Their closest non-cetacean living relatives are the hippopotamuses, from which they and other cetaceans diverged about 54 million years ago. The two parvorders of whales, baleen whales (Mysticeti) and toothed whales (Odontoceti), are thought to have had their last common ancestor around 34 million years ago. Mysticetes include four extant (living) families: Balaenopteridae (the rorquals), Balaenidae (right whales), Cetotheriidae (the pygmy right whale), and Eschrichtiidae (the grey whale). Odontocetes include the Monodontidae (belugas and narwhals), Physeteridae (the sperm whale), Kogiidae (the dwarf and pygmy sperm whale), and Ziphiidae (the beaked whales), as well as the six families of dolphins and porpoises which are not considered whales in the informal sense.

Whales are fully aquatic, open-ocean animals: they can feed, mate, give birth, suckle and raise their young at sea. Whales range in size from the 2.6 metres (8.5 ft) and 135 kilograms (298 lb) dwarf sperm whale to the 29.9 metres (98 ft) and 190 tonnes (210 short tons) blue whale, which is the largest known animal that has ever lived. The sperm whale is the largest toothed predator on Earth. Several whale species exhibit sexual dimorphism, in that the females are larger than males. (Full article...)
Image 14

Restored skeleton

Brygmophyseter, known as the biting sperm whale, is an extinct genus of toothed whale in the sperm whale family with one species, B. shigensis. When it was first described in 1994, the species was placed in the genus Scaldicetus based on tooth morphology, but this was later revised in 1995. In 2006, it was classified into the genus Naganocetus, which is considered to be a junior synonym. The only known specimen, a nearly complete skeleton, was dated to be around 16–15 million years old (middle Miocene). Brygmophyseter is thought to have been 6.5–7 meters (21–23 ft) long, and it probably had 11 or 12 teeth in the upper and lower jaws. Brygmophyseter is part of a group of macroraptorial sperm whales (often shortened to "raptorial") which tended to be apex predators using their large teeth to catch struggling prey such as whales. It had a spermaceti organ which was probably used for biosonar like in the modern sperm whale. The whale has made an appearance on The History Channel's TV series Jurassic Fight Club. (Full article...)
Image 15

The orca (Orcinus orca), or killer whale, is a toothed whale that is the largest member of the oceanic dolphin family. It is the only extant species in the genus Orcinus. Orcas are recognizable by their black-and-white patterned body. A cosmopolitan species, they are found in diverse marine environments, from Arctic to Antarctic regions to tropical seas.

Orcas are apex predators with a diverse diet. Individual populations often specialize in particular types of prey. This includes a variety of fish, sharks, rays, and marine mammals such as seals and other dolphins and whales. They are highly social; some populations are composed of highly stable matrilineal family groups (pods). Their sophisticated hunting techniques and vocal behaviors, often specific to a particular group and passed along from generation to generation, are considered to be manifestations of animal culture. (Full article...)

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Crédito de la foto: División de Recursos Protegidos, Centro de Ciencias Pesqueras del Suroeste, La Jolla, California

La ballena de aleta, con 27 metros de largo, es la segunda ballena y animal más grande después de la ballena azul . Se encuentra en todos los océanos principales del mundo y en aguas que van desde las polares hasta las tropicales . Está ausente sólo en las aguas cercanas a la capa de hielo en los polos norte y sur y en áreas relativamente pequeñas de agua alejadas de los grandes océanos.

Más sobre las ballenas de aleta

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Más sabías...

...la Orca , es el nadador más rápido de todos los cetáceos y puede alcanzar velocidades de más de 50 km/h (30 mph) mientras caza.

...algunos cetáceos pueden sumergirse a profundidades de más de un kilómetro (0,6 millas) y permanecer allí durante más de una hora.

...las crías de cetáceos recién nacidas no tienen la habilidad de nadar durante períodos prolongados ni de acelerar para alejarse del peligro, por lo que nadan a la estela de sus madres, lo que permite a ésta proteger a su cría.

...todos los cetáceos tienen una capa de grasa , una capa de grasa debajo de la piel. En la mayoría de los delfines , esta capa representa entre un cuarto y un tercio del peso corporal total, pero en las ballenas francas australes casi la mitad de su peso (hasta 50 toneladas) será grasa.

...la mayoría de las ballenas y los delfines viven vidas largas. Los delfines mulares salvajes viven hasta los cuarenta años, mientras que algunas de las ballenas más grandes viven más de 80 años.

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Cosas que puedes hacer..

Imágenes generales - cargar nuevo lote

Las siguientes son imágenes de varios artículos relacionados con cetáceos en Wikipedia.

Image 1Ilustración de ballena jorobada
Image 2Delfines de flancos blancos del Pacífico marsopas (de ballena dentada )
Image 3Ilustración de ballena minke antártica
Image 4Los restos de una ballena franca del Atlántico norte tras chocar con la hélice de un barco
Image 5Megalodón cazaba ballenas barbadas del Mioceno (de Ballena barbada )
Image 6Fósil de Squalodon (de ballena dentada )
Image 7Ilustración de la ballena franca del Atlántico sur
Image 8Espectrograma de vocalizaciones de delfines. Los silbidos, quejidos y clics son visibles como V invertidas, estrías horizontales y líneas verticales, respectivamente. (de ballena dentada )
Image 9Ilustración de ballena minke común
Image 10Un esqueleto de ballena jorobada. Observe cómo la mandíbula se divide en dos.
Image 11Ilustración de ballena de Groenlandia
Image 12Restauración de Janjucetus hunderi (de ballena barbada )
Image 13Ilustración de ballena azul
Image 14Ilustración de la ballena del Edén
Image 15Los Archaeomysticetes, al igual que Janjucetus , tenían dientes.
Image 16Ilustración de ballena de aleta
Image 17Una ballena representada por Conrad Gessner , 1587, en su Historiae animalium (de Ballena dentada )
Image 18Características del esqueleto de un cachalote (de Ballena dentada )
Image 19Las ballenas barbadas varían considerablemente en tamaño y forma, dependiendo de su comportamiento alimentario. (de ballena barbada )
Image 20Ilustración de ballena franca pigmea
Image 21Sus ojos son relativamente pequeños para su tamaño.
Image 22Piojos de ballena anaranjados en una ballena franca
Image 23La nariz de la ballena está llena de una sustancia cerosa que se usaba mucho en velas, lámparas de aceite y lubricantes (de Ballena dentada )
Image 24Delfín de flancos blancos del Atlántico capturado durante una cacería en Hvalba, en las Islas Feroe, siendo retirado con una carretilla elevadora (de Ballena dentada )
Image 25Los delfines ( mamíferos acuáticos ) y los ictiosaurios ( reptiles marinos extintos ) comparten una serie de adaptaciones únicas para un estilo de vida totalmente acuático y se utilizan con frecuencia como ejemplos extremos de evolución convergente (de Evolución de los cetáceos )
Image 26Caza científica japonesa de ballenas sobre un par de ballenas minke antárticas (de ballena barbada )
Image 27Especies del infraorden Cetacea (de Evolución de los cetáceos )
Image 28El esqueleto de una ballena de Groenlandia con las extremidades traseras y la estructura ósea pélvica rodeadas de un círculo rojo. Esta estructura ósea permanece interna durante toda la vida de la especie. (de Evolución de los cetáceos )
Image 29Ilustración de ballena gris
Image 30Orca cazando una foca de Weddell (de Ballena dentada )
Image 31Anatomía del delfín mular (de Ballena dentada )
Image 32Gráfico de población mundial de ballenas azules.
Image 33Cráneo de acrofiseter (de Evolución de los cetáceos )
Image 34Ballena franca hembra con cría
Image 35Ballenas jorobadas se alimentan mientras pescan con redes de burbujas
Image 36Ilustración de ballena sei
Image 37Diagrama que ilustra la generación, propagación y recepción del sonido en una ballena dentada. Los sonidos salientes son rojos y los entrantes son verdes (de Ballena dentada )
Image 38Esqueleto de Pakicetus attocki (de Evolución de los cetáceos )
Image 39Placas barbadas accesorias que se estrechan en pequeños pelos (de ballena barbada )
Image 40Biosonar por cetáceos (de Ballena dentada )
Image 41El corazón de una ballena azul con una persona junto a él.
Image 42Una orca llamada Ulises actuando en SeaWorld, 2009 (de Toothed Whale )
Image 43Los arqueocetos (como este Basilosaurus ) tenían una dentición heterodonte (de Evolución de los cetáceos )
Image 44Un árbol filogenético que muestra las relaciones entre familias de cetáceos. (de Evolución de los cetáceos )
Image 45Posibles relaciones entre cetáceos y otros grupos de ungulados. (de Evolución de los cetáceos )
Image 46Ballena de Bryde (rorcual) (de ballena barbada )
Image 47Ilustración de la ballena franca del Atlántico norte
Image 48Una protesta contra la caza científica de ballenas en Japón

¿Sabías que (generado automáticamente)

... que se puede nadar con ballenas jorobadas en el Parque Marino de Usos Múltiples Niue Nukutuluea ?
... que Celia Kaye ganó el Globo de Oro a la actriz revelación más prometedora en 1965 por su papel protagónico en La isla de los delfines azules ?
... que uno de los primeros investigadores que propuso la terapia asistida por delfines para humanos luego renunció a ella?
... que el delfín de río del sur de Asia es casi ciego y depende de la ecolocalización para navegar?
... que los tres delfines en el escudo de Anguila representan "unidad, fuerza y resistencia", que es también el lema del territorio?