Rockhopper penguin (Eudyptes chrysocome) mutual preening behaviour, Rockhopper Point, Sea Lion Island, Falkland Islands, South America

Zebra (Equus quagga) putting head on another one's back, Serengeti, Tanzania, Africa

Scarlet Macaws (Ara macao), adult pair perched on a banana tree, passing on a gift, Roatan, Honduras, Caribbean, Central America, Latin America

King penguins (Aptenodytes patagonicus), pair in courtship, Gold Harbour, South Georgia, Antarctica

Northern Gannets (Morus bassanus, Sula bassana), in spring, mating season, ocean island, Helgoland, Schleswig-Holstein, Germany, Europe

Pair, two, Swainson's Lorikeet (Trichoglossus haematodus moluccanus) sit on branch and beak, also allfarblori, wedge-tailed lory, blue-cheeked lory, broad-banded lori, rainbow lori, captive, occurrence Australia

King penguins (Aptenodytes patagonicus), pair of animals, Volunteer Point, Falkland Islands, Great Britain, South America

King penguins (Aptenodytes patagonicus), St. Andrews Bay, South Georgia, sub-Antarctic and Antarctic

Courtship display. King Penguin (Aptenodytes patagonicus) on the Falkland Islands in the South Atlantic. South America, Falkland Islands, January

Social interaction and behaviour in a group. Magellanic Penguin (Spheniscus magellanicus). South America, Falkland Islands, January

Courtship display. King Penguin (Aptenodytes patagonicus) on the Falkland Islands in the South Atlantic. South America, Falkland Islands, January

Orangutan (Pongo species) adult and young embracing while resting on a wooden board in Tanjung Puting National Park, Central Kalimantan, West Kotawaringin Regency, Indonesia