在以下頻道推出： Prime Video、discovery+、Tubi、Hulu、Sling TV
第 1 季，第 6 集: In this episode, we ask: how did the blue whale become the biggest animal ever? Why do elephants have trunks? Why do ladybugs have spots? Why do some animals live so long? And, why do cats purr?
Documentary · 2019年1月20日 · 20 分鐘