thephotosocietyのインスタグラム(thephotosociety) - 1月11日 03時03分

Video by @Robert Clark // The ostrich is the only living species in the genus Struthio. Ostriches are the only members of the family Struthionidae in the order Struthioniformes—a group that also contains kiwis, emus, cassowaries, and rheas

Not all different speceis get their own day of celebration. Birds are traditionally thought of as a well-studied group, with more than 95 percent of their global species diversity estimated to have been described. Most checklists used by bird watchers as well as by scientists say that there are roughly between 9,000 and 10,000 species of birds.

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• Robert Clark