Tui De Roy / Cactus finch (Geospiza scandens) portrait, Galapagos

Bernard Castelein / Black-hooded sierra finch (Phrygilus atriceps) vicinity of Tupiza, altiplano, Bolivia September

Bernard Castelein / Black-hooded sierra finch (Phrygilus atriceps) vicinity of Tupiza, altiplano, Bolivia September

Pete Oxford / Sharp-beaked ground finch (Geospiza difficilis) on Opuntia cactus. Galapagos. Endemic.

Ole Jorgen Liodden / Sharp-beaked ground finch (Geospiza difficilis) on Opuntia cactus, Galapagos Islands. Endemic.

Ole Jorgen Liodden / Common cactus finch (Geospiza scandens intermedia) on cactus, Galapagos. Endemic.

Donald M. Jones / House Finch (Carpodacus mexicanus) male feeding on cactus flowers, Arizona

Tui De Roy / Common Cactus-Finch (Geospiza scandens) feeding on flowers, Santa Cruz Island, Ecuador

Tui De Roy / Common Cactus-Finch (Geospiza scandens) feeding on flowers, Santa Cruz Island, Ecuador

Tui De Roy / Common Cactus-Finch (Geospiza scandens), Academy Bay, Santa Cruz Island, Ecuador

Tui De Roy / Large cactus finch (Geospiza conirostris), cracking open spiny armored Trebulus seeds. Espanola Island, Galapagos Islands, Ecuador, May.

Tui De Roy / Cactus finch (Geospiza scandens) feeding on cactus flower nectar and pollen. Espanola, Galapagos Islands, November.