Gerrit Vyn / Willow Ptarmigan (Lagopus lagopus) male standing on snow covered ground, vocalising in spring courtship. Males retain the white body plumage of winter plumage and molt the head and neck feathers to th...

Rolf Nussbaumer / Chestnut-Breasted Coronet hummingbird (Boissonneaua matthewsii) adult feeding from fuchsia flower, Papallacta, Ecuador, Andes, South America, January

Tui De Roy / Russet crowned warbler (Basileuterus coronatus) Bellavista cloud forest private reserve, 1700m altitude, Tandayapa Valley, Andean cloud forest, Ecuador

Bryan and Cherry Alexander / Reindeer lichen (Cladonia sp.) and the autumn russet catkins of Dwarf birch (Betula nana) on the tundra in Hurry Inlet. Scoresbysund, East Greenland, September.

David Welling / Russet-tipped Clubtail Dragonfly (Stylurus plagiatus) perching on foliage. Rio Grande Calley, Hidalgo County, Texas, USA.

Tui De Roy / Russet-crowned Warbler (Basileuterus coronatus), Bellavista Cloud Forest Reserve, Tandayapa Valley, Ecuador

Pete Oxford / Russet-crowned Warbler (Basileuterus coronatus) perched on lichen covered branch, captive, Podocarpus National Park, Ecuador

Gerrit Vyn / Willow Ptarmigan (Lagopus lagopus) male standing on snow covered ground, vocalising in spring courtship. Males retain the white body plumage of winter plumage and molt the head and neck feathers to th...

Gerrit Vyn / Willow Ptarmigan (Lagopus lagopus) male standing on snow covered ground, in spring. Males retain the white body plumage of winter plumage and molt the head and neck feathers to the russet brown summer...

Pete Oxford / Russet-crowned Warbler (Basileuterus coronatus), Podocarpus National Park, Ecuador

Andy Sands / Ruby Tiger moth (Phragmatobia fuliginosa) Hertforshire, England, UK

Andy Sands / Ruby Tiger moth (Phragmatobia fuliginosa) showing underwing, Hertforshire, England, UK

Rolf Nussbaumer / Dark-backed Wood-quail (Odontophorus melanonotus) adult, Mindo, Ecuador, Andes, South America, January

Rolf Nussbaumer / Giant Antpitta (Grallaria gigantea) adult, Paz de las aves, Mindo, Ecuador, Andes, South America, January

Rolf Nussbaumer / Chestnut-Breasted Coronet hummingbird (Boissonneaua matthewsii), adult perched, Papallacta, Ecuador, Andes, South America, January

Thomas Marent / Russet-backed Oropendola (Psarocolius angustifrons) on nest, Manu, Peru

Hermann Brehm / Russet backed oropendola (Psarocolius angustifrons) perched on branch, South America

Pete Oxford / Russet mouse lemur {Microcebus rufus} Kirindy, Madagascar

Pete Oxford / Russet mouse lemur {Microcebus rufus} held in hand to show small size, Kirindy, madagascar

Pete Oxford / Russet mouse lemur {Microcebus rufus} Montagne D'ambre NP, Madagascar

Pete Oxford / Russet mouse lemur held in hand {Microcebus rufus} captive, Kirindy Dry Forest Reserve, Madagascar

Luiz Claudio Marigo / Russet-mantled foliage gleaner (ovenbird) at nest in termite mound, Brazil. Endangered.

Luiz Claudio Marigo / Russet-mantled foliage gleaner (ovenbird) at nest in termite mound, Brazil. Endangered.

Michael & Patricia Fogden / Banded Kukri (Oligodon arnensis), India

Pete Oxford / Russet backed oropola {Psarocolius augustifrons} Amazonia Peru