Rolf Nussbaumer / Checkered Garter Snake (Thamnophis marcianus marcianus) coiled with tongue protruding. Fennessey Ranch, Refugio, Corpus Christi, Coastal Bend, Texas Coast, USA

Andy Rouse / Nile crocodile (Crocodylus niloticus) chasing Wildebeest (Connochaetes taurinus) during migration crossing, Masai Mara, Kenya, Africa

Alex Hyde / Light micrograph of pond water including single celled algae called desmids {Desmidiaceae sp}

Laurie Campbell / Bluebells (Hyacinthoides non-scripta) flowering in oakwood, Perthshire, Scotland, UK, May

Mark Bowler,Mark Bowler / Dead Houseflies {Musca domesticus} and Bluebottle flies {Calliphora vomitaria}, UK

Edwin Giesbers / Sea holly (Eryngium maritimum) growing in sand dune, Menorca, Balearic Islands, Spain, Europe

Alex Mustard / A lone Caribbean reef shark (Carcharhinus perezi) cruises over sand ripples. Walkers Cay, Northern Bahama Islands, Republic of Bahamas.

Stephen Dalton / Meadow grasshopper (Chorthippus parallelus) leaping, UK

David Shale / Deepsea octopus (Benthoctopus johnsoniana) Mid-Atlantic Ridge, North Atlantic Ocean

Nick Garbutt / Arctic tern (Sterna Paradisaea) hovering in flight over an iceberg.Peterman Island, Antarctic Peninsula, Antarctica. February.

Nick Garbutt / Stump-tailed Leaf Chameleon (Brookesia superciliaris) on white background, from rainforest leaf-litter. Masoala National Park, Madagascar.

Stephen Dalton / Oak tree {Quercus sp} seedling, UK