These included a pygmy hippopotamus.

这当中包括一头俾格米河马。

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Many of the species are the only representative of groups that have otherwise died out. West Africa's pygmy hippopotamus, known for its thick, oily "blood-sweat, " is the only member of its genus.

很多物种是一些种群的唯一代表，否则这些种群早就灭绝了。西非的矮河马，它以稠而油的血汗被人们所知，是其种群的唯一成员。

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