Steven David Miller / Eclectus parrot (Eclectus roratus) female perched in a tree, The Wildlife Habitat Zoo, Port Douglas, Queensland, Australia. August. Captive.

Markus Varesvuo / Black grouse (Lyrurus tetrix) mating in snow, Utajarvi, Finland, May.

Dong Lei / Asian paradise-flycatcher (Terpsiphone paradisi) pair perched on branch, Shanyang town, Gutian County, Hubei province, China.

Nick Garbutt / Bare-faced Curassow (Crax fasciolata) male and female, Near Araras Lodge, Mato Grosso, Northern Pantanal, Brazil, South America.

Juan Carlos Munoz / Black howler monkeys (Alouatta caraya) male and two females calling from tree, captive, Apenheul Park, Netherlands.

Petra Wegner / Cavalier King Charles Spaniels, ruby and tricolour, sitting in snow.

Konrad Wothe / Eclectus Parrot (Eclectus roratus) courtship behaviour in rainforest, Cape York Peninsula, North Queensland, Australia, captive

Konrad Wothe / Eclectus Parrot (Eclectus roratus) pair in rainforest, female on right, Cape York Peninsula, North Queensland, Australia, captive

Aflo / Group portrait of three Chihuahua puppies, sitting on white towels

Petra Wegner / Five Cavalier King Charles Spaniel sitting, black-and-tan, tricolour, blenheim and ruby coated, sitting in autumn leaves

Petra Wegner / Two Cavalier King Charles Spaniels, blenheim and tricolour coated, sitting wearing reindeer antlers

Petra Wegner / Two Miniature Schnauzers, black-silver and pepper-and-salt coated, sitting in autumn foliage