Tui De Roy / Short-tailed Albatross (Phoebastria albatrus) subadult and adult pair, Hatsunezaki, Torishima Island, Japan

Tui De Roy / Short-tailed Albatross (Phoebastria albatrus) pair allopreening, Tsubamezaki, Torishima Island, Japan

Martin Willis / Blue and Yellow Macaw (Ara ararauna), and Scarlet Macaw (Ara macao) preening, Jurong Bird Park, Singapore

Martin Willis / Galah (Eolophus roseicapilla) pair preening, Artemis Station, Cape York Peninsula, Australia

Bret Charman / Sulphur-crested cockatoo (Cacatua galerita) pair, allopreening perched in Eucalyptus (Eucalyptus sp.) tree, Botanical Gardens, Sydney, New South Wales, Australia.

Tui De Roy / Nazca Booby (Sula granti) pair courting, Genovesa Island, Galapagos Islands, Ecuador

Jasper Doest / Northern Gannet (Morus bassanus) pair allopreening each other, Saltee Islands, Republic of Ireland

Jasper Doest / Northern Gannet (Morus bassanus) couple preening each other, Saltee Islands, Republic of Ireland

Vishal Jadhav / Woolly-necked stork (Ciconia episcopus) pair allopreening, Maharashtra, India, August.

Bruce Thomson / Scaly-breasted lorikeet (Trichoglossus chlorolepidotus) pair allopreening in a branch of a tree, Toowoomba, Queensland, Australia.

George Sanker / Great grey owl (Strix nebulosa) pair allopreening in conifer tree, Yellowstone National Park, Wyoming, USA.

Bruce Thomson / Scaly breasted lorikeet (Trichoglossus chlorolepidotus) pair allopreening in branch of tree, Toowoomba, Queensland, Australia.