Whales used to have large legs

Whales had large back legs and a tail. This was discovered in a fossil study. The early whale from 38 to 40 milion years ago had legs which helps to pinpoint the advent of “modern” whale flukes.
Flukes are the two wide, flat triangular lobes on the back end of the whale. These lobes are made of skin and connective tissue, with bones in the middle.

Whales evolved from semiaquatic, four-footed animals with long, thin tails.

Source: National Geographic

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