A person feeds pigeons in Piazza Duomo (Cathedral Square), Milan, Lombardy, Northern Italy, Italy, Europe

Pigeons feed on grain scattered on the paving stones in the courtyard of Jama Masjid (Friday Mosque), Old Delhi, Delhi, India, Asia

A well-scarred old male polar bear (Ursus maritimus) on a fresh bearded seal kill near Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

A well-scarred old male polar bear (Ursus maritimus) on a fresh bearded seal kill near Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Dipper (Cinclus cinclus) perching on pier with old sailing rope in background. Dippers often perch on rocks, fence posts and piers surveying the water, calling or just having a good preen. . Argyll, Scotland

Adult gentoo penguin (Pygoscelis papua) feeding minutes-old newly hatched chick at Gold Harbor on South Georgia, Southern Ocean

People selling food for pigeons at the New Mosque, Eminonu Yeni Camii, Eminonu, Istanbul, Turkey

Hoopoe (Upupa epops) Old bird feeds the young bird with lizard tail, Middle Elbe Biosphere Reserve, Saxony-Anhalt, Germany, Europe

Common starling (Sturnus vulgaris), old bird feeding young bird at the breeding cavity, Hesse, Germany, Europe

Hoopoe (Upupa epops), sitting with food on an old olive tree

Hoopoe (Upupa epops), sitting with food on an old olive tree

Garden Warbler (Sylvia borin), adult eating on Common Elderberry (Sambucus nigra), Oberaegeri, Zug, Switzerland