Some whales have fins, but not all species do. Some types of whales have dorsal fins similar to a dolphin's that help them to swim. More »

The dorsal fin provides stability while swimming. It may also regulate body temperature in warm-blooded animals such as the dolphin. The dorsal fin is located at the top of the animal. More »

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Dorsal fin collapse can be caused by many factors including stress, old age, dehydration and fighting. For killer whales in captivity, the main reason for dorsal fin collapse is the swimming conditions. More »

Whales have hair, as all species of whales are aquatic mammals. Instead of having scales, like most other marine animals, whales have a fine layer of hair over their bodies. More »

Killer whales, some species of sharks, Arctic wolves, polar bears, cougars, brown hyenas, various canid species and even other types of seals prey on seals. Some species of seals don't have any natural predators due to w... More »

Depending upon the species, whales can hear each other up to 1,000 miles away. Whales use their sounds to communicate and to navigate the ocean with echolocation. More »

Homologous structures, such as the fins of whales and the hands of monkeys, demonstrate that while a species may use structures for different purposes, the species shared a common ancestor. By definition, homologous stru... More »