Oscar Dewhurst / Crested duck (Lophonetta specularioides) walking on a frozen Andean lake. Arequipa, Peru. September. Cropped

Oscar Dewhurst / Giant coot (Fulica gigantea) feeding in an Andean lake. Arequipa, Peru. September

Oscar Dewhurst / Giant coot (Fulica gigantea) and young chick in an Andean lake. Arequipa, Peru. September

Oscar Dewhurst / Andean gull (Chroicocephalus serranus) in flight. Arequipa, Peru. September

Oscar Dewhurst / Puna teal (Anas puna) standing in shallow water of an Andean lake. Arequipa, Peru. September. Cropped

Oscar Dewhurst / Yellow-billed teal (Anas flavirostris) swimming in Andean lake. Arequipa, Peru. September

Oscar Dewhurst / Puna ibis (Plegadis ridgwayi) on grass mound in Andean lake. Arequipa, Peru. September. Cropped

Oscar Dewhurst / Yellow-billed teal (Anas flavirostris) perched on rock in river. Arequipa, Peru. September. Cropped

Oscar Dewhurst / Variable hawk (Geranoaetus polyosoma) in flight. Arequipa, Peru. September. Cropped

Oscar Dewhurst / White-capped dipper (Cinclus leucocephalus) perched on rock in fast-flowing river. Arequipa, Peru. August

Roland Seitre / Andean condors (Vultur gryphus) perched on rock, with one flapping wings, with mountainous habitat in the background, Chivay, Arequipa , Peru.

Roland Seitre / Andean condor (Vultur gryphus) perched on rock with mountainous habitat in the background, Chivay, Arequipa , Peru.