Washington, September 12 : A new fossil study has indicated that ancient whales has large back legs, a tail like a dog’s, and a hip-wiggling swimming style, which helps pinpoint the advent of new physical features in modern whales between 38 and 40 million years ago.
The new features are known as ‘flukes’, which 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.