Ancient crocodiles walked on two legs like dinosaurs

An international research team has been stunned to discover that some species of ancient crocodiles walked on their two hind legs like dinosaurs and measured over three meters in length.

Fins and limbs tell evolutionary tale

About 400 million years ago, our early ancestors took their first hesitant steps out of the primordial seas on to land.

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Leg

A leg is a weight bearing and locomotive structure, usually having a columnar shape. During locomotion, legs function as "extensible struts" - the combination of movements at all joints can be modeled as a single, linear element capable of changing length and rotating about an omnidirectional "hip" joint.

As an anatomical animal structure it is used for locomotion. The distal end is often modified to distribute force (such as a foot). Most animals have an even number of legs.

As a component of furniture it is used for the economy of materials needed to provide the support for the useful surface, the table top or chair seat.

This text uses material from Wikipedia, licensed under CC BY-SA