在大自然的动物世界中，如果幼崽的父母死亡或失去了抚养的能力，幼崽们可能不会那么幸运或轻易地找到养父母。
In the world of animals in nature, the young may not be so lucky or easy to find a foster parent if their parents die or lose the ability to raise them.
在巴布亚新几内亚的博萨维火山口，科学家们发现了一处被遗忘的动物世界，那里有四十多个前所未见的新物种。
A lost world populated by fanged frogs, grunting fish and tiny bear-like creatures has been discovered in a remote volcanic crater on the Pacific island of Papua New Guinea.
普遍认为猎豹是世界上跑得最快的动物。
The cheetah is generally credited as the world's fastest animal.
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