Patricio Robles Gil / Guayalejo River flowing through cloud forest, Tamaulipas, Sierra Madre Oriental, northeast Mexico

Patricio Robles Gil / Fog rolling over cloud forest, Altas Cumbres Protected Area, Tamaulipas, Sierra Madre Oriental, northeast Mexico

Patricio Robles Gil / Semi-aquatic communities of Water Lilies in a wetland near the Tamesi River, south Tamaulipas, Mexico

Patricio Robles Gil / Accumulated rainwater on a Mafafa leaf in El Cielo Biosphere Reserve in the mountains of the Sierra Madre Oriental, Tamaulipas, northeast Mexico

Claudio Contreras / Headwaters of the Rio Frio, El Cielo Biosphere Reserve, Tamaulipas, northeast Mexico, August

Jack Dykinga / Flowering Yucca (Yucca carnerosana) in foggy habitat, Tamaulipas, Sierra Tamaulipas, Mexico, February 2004.

Claudio Contreras / Glaucous Cracker Butterfly (Hamadryas glauconome) Aldama, Tamaulipas, northeastern Mexico, August.

Sandesh Kadur / Kemp's Ridley Sea Turtle (Lepidochelys kempii) digging a nest in sand beach. Rancho Nuevo, Tamaulipas, Mexico, June.

David Welling / Altimara Oriole (Icterus gularis) adult at nest, Tamaulipas State, Mexico, Central America, May

David Welling / Altimara Oriole (Icterus gularis) adult at nest, Tamaulipas State, Mexico, Central America, May

Barry Mansell / Naked backed / Moustached / Leaf-lipped bat (Pteronotus personatus) in flight with mouth open, Tamaulipas, Mexico

Barry Mansell / Ghost faced bat (Mormoops megalohylla) in flight, Tamaulipas, Mexico

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.