Lemurs, lizards, whales — all are famed for their tails in some way. But which animal has the longest tail of all? In proportion to their bodies, grass lizards have the longest tails of any ...

Narrator: Tails are like opinions — basically ... us a huge advantage Because unlike four-legged animals, which have to pour energy into every step they take, two legs take advantage of gravity ...

Tails are like opinions - basically ... gives us a huge advantage Because unlike four-legged animals, which have to pour energy into every step they take, two legs take advantage of gravity ...