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The oldest evidence of four-legged animals walking on land has been discovered in southeast Poland. Rocks from a disused quarry record the "footprints" of unknown creatures that lived about 397 million years ago.


 evolution leg walking
This means the caterpillar is able to "tell" an intruder to go away without risking injury in a conflict.


 caterpillar animal communication walking leg drumming
The new feet are custom-made implants that "peg" the ankle to the foot. They are bioengineered to mimic the way deer antler bone grows through the skin.


 bone bioengineering leg foot cat deer antler prosthetic
Scientists have filmed an African lungfish using two fins to walk and "bound" along the bottom of its tank.


 fish leg walking evolution fin