Mark Moffett / Strawberry Poison Dart Frog (Oophaga pumilio) group showing color variation from different islands, Bocas del Toro, Panama

Fred Bavendam / Common Comet Star (Linckia guildingii) in an unusual lavender color variation, it is typically beige or yellowish in color, Manado, North Sulawesi, Indonesia

Duncan Murrell / Green garden lizard (calotes calotes) showing color variation, Deniyaya, Sri Lanka.

Franco Banfi / Golden grouper (Mycteroperca rosacea), yellow color-variation of the most common leopard grouper species, Cabo Pulmo Marine National Park, Baja California Sur, Mexico

Franco Banfi / Golden grouper (Mycteroperca rosacea), yellow color-variation of the most common leopard grouper species, Cabo Pulmo Marine National Park, Baja California Sur, Mexico

Chase Dekker / Red Fox (Vulpes vulpes) kits, Washington

Chase Dekker / Red Fox (Vulpes vulpes) kits playing, Washington

Chase Dekker / Red Fox (Vulpes vulpes) kits at den, Washington

Rod Williams / Jersey tiger moth (Euplagia quadripunctaria) with less common yellow colour variation feeding on ragwort, Lewisham, London, UK, August.

Tim Fitzharris / Gray Wolf (Canis lupus)group with submissive licking dominant wolf, Montana

Mark Raycroft / Labrador Retriever (Canis familiaris) trio

Mark Raycroft / Labrador Retriever (Canis familiaris) trio in water