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Squalodontidae or the shark-toothed dolphins is an extinct family of large toothed whales who had long narrow jaws. [2] Squalodontids are known from all continents except Antarctica, from the Oligocene to the Neogene , but they had a maximal diversity and global distribution during the Late Oligocene and Early to Middle Miocene ( 28 to 15 mya ).
A common bottlenose dolphin (Tursiops truncatus). A dolphin is an aquatic mammal in the clade Odontoceti (toothed whale).Dolphins belong to the families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the New World river dolphins), Pontoporiidae (the brackish dolphins), and possibly extinct Lipotidae (baiji or Chinese river dolphin).
The angel shark has unique features that differentiates them from other sharks. They are considered as smaller sized sharks because they grow up to only 7 feet (2.1 m) and can weigh around 77 pounds (35 kg), as opposed to the whale shark that can measure up to 32 feet (9.8 m) and weigh 20,000 pounds (9,100 kg).
Shark migration patterns may be even more complex than in birds, with many sharks covering entire ocean basins. Sharks can be highly social, remaining in large schools. Sometimes more than 100 scalloped hammerheads congregate around seamounts and islands, e.g., in the Gulf of California. [41] Cross-species social hierarchies exist.
The tiger shark is the only species in its family that is ovoviviparous; its eggs hatch internally and the young are born live when fully developed. [7] Tiger Sharks are unique among all sharks in the fact that they employ embrytrophy to nourish their young inside the womb. The young gestate in sacks which are filled with a fluid that nourishes ...
[76] [79] Competition between orcas and white sharks is probable in regions where their diets overlap. [80] The arrival of orcas in an area can cause white sharks to flee and forage elsewhere. [81] [82] Orcas appear to target the liver of sharks. [76] [79] In one case a single orca was observed killing and eating a great white shark on its own ...
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.
The thresher shark mainly feeds on schooling pelagic fish such as bluefish, juvenile tuna and mackerel, which they are known to follow into shallow waters, as well as squid and cuttlefish. [16] Crustaceans and occasionally seabirds are also eaten. The thresher shark stuns its prey by using its elongated tail as a whipping weapon.