Marie Read / Common tern (Sterna hirundo) adult and chick sat on nest on sandy beach. The chick moves beneath the adult for warmth. Long Island, New York, USA

Natalie Clements / Moorhen (Gallinula chloropus) chick moves beneath adult on nest for warmth, adult preening chick, south Wales, July.

Natalie Clements / Green woodpecker (Picus viridis) adult regurgitating food and feeding chicks (two days from fledging) that are begging for food at the nest hole, then entering the nest hole, south Wales, July.

Natalie Clements / Green woodpecker (Picus viridis) adult landing on the front of the tree near its nest hole, regurgitating food and feeding chicks (two days from fledging) that are begging for food at the nest hole, s...

Manuel Gracia / Whiskered tern (chilidonias hybrida) adult flies into frame with dead frog (Anura sp.), prey is passed to other adult which is then fed to one of the begging chicks on the nest, one of the adult leave...

Warren Pereira / Bengal tiger (Panthera tigris tigris) female grooming and playing with cub, cub attempts to climb tree while mother cleans her paws, Ranthambhore, India, November.

Roman Willi / Young beaver (Fiber castor) swims to mother beaver (Fiber castor), mother proceeds to groom and nuzzle her young, Lucerne, Switzerland, July.

Harry Collins / Pileated woodpecker (Dryocopus pileatus) adult feeding chick in nest hole in tree trunk before leaving frame, Florida, USA, May.

Harry Collins / Piping plover (Charadrius melodus) chicks shelter under adult for warmth and protection, then one chick appears, Jersey Shore, New Jersey, USA, May.

Michael Hutchinson / Dark-edged beefly (Bombylius major) collecting dust at the tip of their abdomen to coat its eggs which helps protect the eggs from drying out, Bristol, UK, April.

Terry Whittaker / Black guillemot (Cepphus grylle) brings butterfish (Pholis gunellus) prey to its nest within harbour wall, Portpatrick Harbour, Scotland, May.

Terry Whittaker / Black guillemot (Cepphus grylle) flying to its nest in harbour wall with food in its beak, Portpatrick Harbour, Scotland, May.