Ashley Cooper / New electrified railway line built into Alicante, Murcia, Spain. May 2011.

Ashley Cooper / New electrified railway line built into Alicante, Murcia,, Spain. May 2011.

Konrad Wothe / Three-toed Sloth (Bradypus tridactylus) sleeping in rainforest tree at Tambopata river, Tambopata National Reserve, Peru, South America.

Juan Carlos Munoz / Mixed flock of White storks (Ciconia ciconia), Common spoonbills (Platalea leucorodia) and Cattle egrets (Bubulcus ibis) settling to roost in a tree, Doñana National Park, Andalusia, Spain, May.

Christophe Courteau / Walrus (Odobenus rosmanus) colony hauled out on a beach, Poolpynten, Svalbard, Norway, June, 2012.

Edwin Giesbers / Oriental small clawed otter (Aonyx cinerea), captive.

Michele Westmorland / Sleeping white-tip reef sharks (Triaenodon obesus) Galapagos Islands.

Michele Westmorland / Woman filming Galapagos sea lion (Zalophus wollebaeki) on the beach of Islabela Island, Galapagos Island, Model released.

Mark Taylor / Cute Toy goldendoodle puppy sleeping on teddy bear.

Nick Upton / Torpid Common / Hazel dormouse (Muscardinus avellanarius) found sleeping in a Dormouse nestbox set out by Backwell Enviroment Trust in coppiced woodland near Bristol, Somerset, UK, June.

Nick Upton / Torpid Common / Hazel dormouse (Muscardinus avellanarius) sleeping while held in human hand during a survey by Backwell Enviroment Trust in coppiced woodland near Bristol, Somerset, UK, June. Model re...

Florian Möllers / Common cranes (Grus grus) gathering at a roost site, Rhinluch NABU Reserve, Brandenburg, Germany, October.