Joel Sartore / Photo Ark / Pearlscale butterflyfish (Chaetodon xanthurus) swimming into view before leaving, The Fish Store, Nebraska, Lincoln, USA.

Terry Whittaker / Sand martins (Riparia riparia) flying into colony nests flooded by rising River Tame, Greater Manchester, UK.

Terry Whittaker / Sand martins (Riparia riparia) flying into colony nests flooded by rising River Tame, Greater Manchester, UK.

Terry Whittaker / White-throated dipper (Cinclus cinclus) calling as it enters nest in a pipe under road bridge , River Mersey, Greater Manchester, UK.

Nick Upton / Jackdaw (Corvus monedula) pair taking off to fly from a chimney pot they are nesting in, Wiltshire, UK, March.

Nick Upton / Jackdaw (Corvus monedula) emerging from the metal cowl of a chimney it is nesting in and flying off with its mate, Wiltshire, UK, March.

Neil Aldridge / Close up shot of Common green grasshopper (Omocestus viridulus) eating grass before leaving, Somerset, UK, July.

Brian Bevan / Male Kingfisher (Alcedo atthis) landing on perch, Bedfordshire, UK, July.

Brian Bevan / Slow motion clip of Common tern (Sterna hirundo) flying into frame and taking fish from waters surface before exiting frame, Bedfordshire, UK, July.

Brian Bevan / Melanistic Grey squirrel (Sciurus carolinensis) feeding on acorn before exiting frame, Bedfordshire, UK, October.

Brian Bevan / Melanistic Grey squirrel (Sciurus carolinensis) sitting in tree feeding on chestnut, Bedfordshire, UK,

Simon Littlejohn / Two European otter (Lutra lutra) pups (approximately 12 weeks old) sitting in the shallows waiting for their mother to return before they both turn and dive into the water, River Stour, Dorset, UK, Oc...