Animal, Deer.

Animals that migrate face myriad threats to their survival, all of which have a common denominator: human activity. That's according to a first-of-its-kind report published Monday by the Convention on the Conservation of Migratory Species of Wild Animals (CMS), a United Nations treaty. More than one in five of the species listed by CMS are threatened with extinction.

Habitat destruction, pollution, unsustainable hunting and fishing, and climate change are among the ways people are disrupting routes migratory species traverse each year. To mitigate these threats, the convention calls for more meaningful action and cooperation across borders and between governments, the private sector and other stakeholders