Select the advantages that a biped or facultative quadruped could gave.

选择双足动物或兼性四足动物可以提供的优势。

Let's think of some of the advantages of being a biped or facultative quadruped.

让我们想想作为双足动物或兼性四足动物的一些优势。

Remember a facultative quadruped is a biped that has the option to move on four limbs, just not all the time.

请记住，兼性四足动物是一种可以用四肢移动的双足动物，只是不是一直都可以。

It typically bounds at high speeds on two legs, but will walk on four legs when it is moving more slowly it would be considered a facultative quadruped.

它通常用两条腿高速跳跃，但当它移动得更慢时会用四条腿行走，这将被视为兼性四足动物。