两足动物

例句：

1. 1. Many species of animals are known to be bipeds.
   许多物种已知是两足动物。
2. 2. The kangaroo is a well-known quadruped.
   袋鼠是一种广为人知的四足动物。
3. 3. Some scientists believe that all animals are bipeds or quadrupeds.
   一些科学家认为所有动物都是两足动物或四足动物。