Sylvain Cordier / Monarch butterfly (Danaus plexippus) wintering in Oyamel pine forests (Abies religiosa) Monarch Butterfly Biosphere Reserve / Reserva de Biosfera de la Mariposa Monarca UNESCO World Heritage Site, An...

Nigel Cattlin / Insect / invertebrate house / bug hotel with various refuge options for hiding / over-wintering, WWT, West Sussex, UK, July.

SCOTLAND: The Big Picture / Turnstones (Arenaria interpres) and Purple sandpipers (Calidris maritima) over wintering on the beaches of the Orkney Isles, Scotland, UK, April.

Sylvain Cordier / Monarch butterfly (Danaus plexippus), wintering from November to March in Oyamel pine forests (Abies religiosa) Monarch Butterfly Biosphere Reserve, Mexico.

Konrad Wothe / Mixed flock of Snow geese (Chen caerulescens atlanticus / Chen caerulescens) and Sandhill cranes (Grus canadensis) at wintering area at dawn, with full moon, Bosque del Apache, New Mexico, USA, Novemb...

Jeff Vanuga / Elk (Cervus canadensis) wintering on the National Elk Refuge, Jackson, Wyoming, USA, February.

Wild Wonders of Europe / Ziegler / African chameleon (Chamaeleo africanus) portrait, photographed in a captive wintering program, The Peloponnese, Greece, May 2009

Wild Wonders of Europe / Ziegler / African chameleon (Chamaeleo africanus) in tree, in a captive wintering program, The Peloponnese, Greece, May 2009

Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, mass flying in wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico

LYNN M. STONE / American white pelican wintering in Florida USA {Pelecanus erythrorhynchos}

Konrad Wothe / Whooper Swan (Cygnus cygnus) pair arguing at wintering site, Kussharo-ko, Hokkaido, Japan

Konrad Wothe / Red-crowned Crane (Grus japonensis) pair calling during courtship dance at their wintering grounds, Hokkaido, Japan