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The whale shark ( Rhincodon typus) is a slow-moving, filter-feeding carpet shark and the largest known extant fish species. The largest confirmed individual had a length of 18.8 m (61.7 ft). [8] The whale shark holds many records for size in the animal kingdom, most notably being by far the most massive living non-cetacean animal.
Reproductive system Depiction of shark anatomy including eggs, pups, and the liver. Sharks' reproductive organs serve to reproduce sexually where the male delivers sperm to the female using claspers that insert into the female's oviduct. This then allows the female to give birth to live young, although some do lay eggs.
Basking shark. The basking shark ( Cetorhinus maximus) is the second-largest living shark and fish, [4] after the whale shark. It is one of three plankton-eating shark species, along with the whale shark and megamouth shark. Typically, basking sharks reach 7.9 m (26 ft) in length.
The sperm whale is a pelagic mammal with a worldwide range, and will migrate seasonally for feeding and breeding. [5] Females and young males live together in groups, while mature males (bulls) live solitary lives outside of the mating season. The females cooperate to protect and nurse their young.
Etymology. Until the 16th century, sharks were known to mariners as "sea dogs". This is still evidential in several species termed "dogfish," or the porbeagle.The etymology of the word shark is uncertain, the most likely etymology states that the original sense of the word was that of "predator, one who preys on others" from the Dutch schurk, meaning 'villain, scoundrel' (cf. card shark, loan ...
Description. Narwhals near the water surface. Illustration of a narwhal. The narwhal is an agile medium-sized whale. Adults have a body-to-tail length of 3.0 to 5.5 m (9.8 to 18.0 ft) and weigh 800 to 1,600 kg (1,800 to 3,500 lb). They exhibit sexual dimorphism, with males being larger and heavier than females.
Labelled skull diagram of D. terrelli. The type species, D. terrelli, is the largest, best-known species of the genus. Size estimates for this species range from 4.1–10 m (13–33 ft) in length, though estimates greater than 4.5 m are poorly supported. Skulls of this species can be up to 60–70 cm (24–28 in) in length.
5. Sea Otter. Climate change is just one of the many reasons these adorable creatures are slowly becoming extinct. Oil spills, contaminated water, and a lack of food sources are to blame ...