Crash Course: Biology
Speciation: Of Ligers and Men
00:18 - 05:27

Hank explains what defines a species: the ability to create fertile offspring. He also explains the conditions that are required to create an entirely new species.

Key Words: Species, Hybrids, Evolution, Speciation, Reproductive Isolation, Post-zygotic, Pre-zygotic, Allopatric Speciation, Natural Selection 

This clip contains profanity at the following moments: 00:30 - 00:34 , 00:34 - 00:35 , 00:35 - 00:37 , 00:37 - 00:38 , 00:38 - 00:42 , 01:22 - 01:25 , 05:11 - 05:14

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