Marcos Baumann/ BIA / Mountain Parakeet (Bolborhynchus aurifrons) pair, Chile

Glenn Bartley/ BIA / Burrowing Parrot (Cyanoliseus patagonus), Andes, Chile

Glenn Bartley/ BIA / Slender-billed Parakeet (Enicognathus leptorhynchus), Andes, Chile

Glenn Bartley/ BIA / Slender-billed Parakeet (Enicognathus leptorhynchus) feeding on flowers, Andes, Chile

Cyril Ruoso / Mountain parakeet (Psilopsiagon aurifrons) flock perched on cacti, Colca Canyon, Andes, Peru, November.

Cyril Ruoso / Mountain parakeet (Psilopsiagon aurifrons) flock perched on cacti, Colca Canyon, Andes, Peru, November.

Dong Lei / Derby's parakeet (Psittacula derbiana) flock in flight, Kawakarpo Mountain, Meri Snow Mountain National Park, Yunnan Province, China, October 2009.

Dong Lei / Derby's parakeet (Psittacula derbiana) perched, Kawakarpo Mountain, Meri Snow Mountain National Park, Yunnan Province, China.

Dong Lei / Derby's parakeet (Psittacula derbiana) perched in tree, Kawakarpo Mountain, Meri Snow Mountain National Park, Yunnan Province, China.

Dong Lei / Derby's parakeet (Psittacula derbiana) on branch, Kawakarpo Mountain, Meri Snow Mountain National Park, Yunnan Province, China.

D. Parer & E. Parer-Cook / Budgerigar (Melopsittacus undulatus) juvenile, Trephina Gorge, Northern Territory, Australia

Dong Lei / Derby's parakeet (Psittacula derbiana) flock in flight over forest, Meili Snow Mountain National Park, Yunnan Province, China, October.