Nature Picture Library offers the best nature photographs and footage from the world's finest photographers, to license for commercial and creative use. More than 700,000 images and video clips online, from tigers to turtles and elephants to sharks.
Alan Williams / Beaver Bridge over River Conwy, near Betws-y-Coed, Snowdonia National Park, North Wales, UK, September 2018
Alan Williams / Domestic pigeons (Columba livia) flock in flight over houses, Cheshire, UK, June.
Alan Williams / Oystercatcher (Haematopus ostralegus) perched on rock on shore, North Uist, Outer Hebrides, Scotland, UK, May
Alan Williams / Two Red Kites (Milvus milvus) fighting in flight. Mid-Wales, UK, October 2010.
Alan Williams / Male Ruddy Duck (Oxyura jamaicensis) displaying on lake expelling air from breast feathers to form bubbles (captive bird) UK, May 2010
Alan Williams / Black-tailed Godwits (Limosa limosa) and Knots (Calidris canutus) in flight in early morning light, Dee Estuary, Merseyside, England, UK, February
Alan Williams / Robin (Erithacus rubecula) perched in snow covered branches, Cheshire, UK, January
Alan Williams / Robin (Erithacus rubecula) on snow covered lawn, Cheshire, UK, January
Alan Williams / Dunnock (Prunella modularis) perched on fence in garden, Cheshire, UK, January
Alan Williams / Female blackcap (Sylvia atricapilla) perched in garden shrub, Cheshire, UK, December
Alan Williams / Grey Heron (Ardea cinerea) in flight, being chased by Lapwing (Vanellus vanellus) North Wales, UK, May
Alan Williams / Yellow wagtail (Motacilla flava flavissima) male singing perched on Rapeseed flower head, Essex, UK, May