Tui De Roy / Marine iguana (Amblyrhynchus cristatus) males in breeding colouration on rocks, with sun halo, Floreana Island, Galapagos

Tony Wu / Asian sheepshead wrasse (Semicossyphus reticulatus), male in white breeding colouration. Niigata Prefecture, Honshu, Japan. June.

Robert Thompson / Garden tiger moth (Arctia caja) Killard Point NNR, Ballyhornan, County Down, Northern Ireland.July.

Tui De Roy / Marine iguana (Amblyrhynchus cristatus), male in full breeding colours Floreana Island, Galapagos.

Ingo Arndt / Saturniid moth caterpillar with warning colouration {Syssphinx mexicana} Guanacaste, Costa Rica

Ingo Arndt / Yellow bellied toad {Bombina variegata} Germany

Bence Mate / Great egret (Ardea alba) with green colouring near beak during breeding season, Lake Csaj, Pusztaszer, Hungary, April.

Markus Varesvuo,Markus Varesvuo / Willow grouse (Lagopus lagopus) in winter plumage, Utsjoki, Finland, April.

Petra Wegner,Petra Wegner / Cavalier King Charles Spaniel puppies aged 7 weeks, with tricolour and blenheim colouration, on hay bale in straw

Petra Wegner,Petra Wegner / Cavalier King Charles Spaniel puppies aged 7 weeks with tricolour and blenheim colouration, in basket in straw

Petra Wegner / Cavalier King Charles Spaniel, puppy aged 7 weeks with blenheim colouration, resting on hay bale in straw

Jane Burton / Blue Dutch rabbit with kitten with matching colouration.