Prehistoric Whales Had Legs and Tails, Wiggled Hips
An early whale had large back legs, a tail like a dog’s, and a hip-wiggling swimming style, according to a new fossil study.
The discovery helps pinpoint the advent of “modern” whale flukes to between 38 and 40 million years ago, scientists say.
Flukes are the two wide, flat triangular lobes on a whale’s back end and are made of skin and connective tissue, with bones in the middle.
Scientists have known whales evolved from semiaquatic, four-footed creatures with long, thin tails to today’s fully aquatic mammals with fluked tails, no back legs, and flippers instead of front legs.
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