BirdLife International reports that of the world's estimated 9,799 bird species, 2,005 are classified as threatened or endangered. The most critically endangered species include Peru's Purple-backed Sunbeam Hummingbird (Aglaeactis aliciae) and Tanzania's Uluguru Bush-shrike (Malaconotus alius).

The greatest threats many bird species face is habitat degredation and destruction.

Find out more: Record Number of Bird Species Heading Towards Extinction (BirdLife International)

Photo © Martin Harvey (BirdLife International)