SCOTLAND: The Big Picture / Red Squirrel (Sciurus vulgaris) tossing away the husk from hazelnut, Cairngorms National Park, Highlands, Scotland, UK, November.

SCOTLAND: The Big Picture / Red Squirrel (Sciurus vulgaris) scratching, Cairngorms National Park, Highlands, Scotland, UK, December.

Chris Mattison / Small White / Cabbage white butterfly (Pieris rapae) on Lavender, Sheffield, UK July (Focus-stacked image)

Claudio Contreras / American crocodile (Crocodylus acutus) exhaling bubbles underwater, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico, May.

Claudio Contreras / American crocodile (Crocodylus acutus) split level with animal resting at surface in shallow water over seagrass bed, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Claudio Contreras / American crocodile (Crocodylus acutus) resting just above seagrass underwater, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Claudio Contreras / American crocodile (Crocodylus acutus) extreme close up with jaws open, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Bernard Castelein / Ankarana sportive lemur (Lepilemur ankaranensis), Ankarana National Park, Madagascar

Alex Hyde / Lemur leaf frog (Agalychnis lemur) Central Caribbean foothills, Costa Rica. IUCN Red List critically endangered species.

Lucas Bustamante / Anthony's poison-frog (Epipedobates anthonyi) seen through hole in leaf. Buenaventura Reserve, El Oro, Ecuador.

David Pattyn / Zanzibar red colobus monkey (Procolobus kirkii) portrait in a tree, Jozani forest, Jozani Chwaka Bay NP, Zanzibar, Tanzania, August

Pascal Kobeh / Long-snouted seahorse (Hippocampus guttulatus) with prehensile tail twined round seagrass, Etang de Thau Lagoons, Languedoc-Roussillon, France.