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The hindlimbs of cetaceans are internal, and are thought to be vestigial.Baleen whales have short hairs on their mouth, unlike the toothed whales.Though not as flexible or agile as seals, cetaceans can swim very quickly, with the killer whale able to travel at 56 kilometres per hour (35 mph) in short bursts and the fin whale able to cruise at 48 kilometres per hour (30 mph).Dolphins are able to make very tight turns while swimming at high speeds.
Cetaceans have been depicted in various cultures worldwide.
Dolphins are commonly kept in captivity and are even sometimes trained to perform tricks and tasks, other cetaceans aren't as often kept in captivity (with usually unsuccessful attempts).
Cetaceans have been relentlessly hunted by commercial industries for their products, although this is now forbidden by international law.
Male cetaceans typically mate with more than one female (polygyny), although the degree of polygyny varies with the species. Male cetacean strategies for reproductive success vary between herding females, defending potential mates from other males, or whale song which attracts mates.
Calves are typically born in the fall and winter months, and females bear almost all the responsibility for raising them.
Some species are well adapted for diving to great depths.