Bryan and Cherry Alexander / Chukchi girls, with their family's ancestral clan mark painted in reindeer blood on their face, a ritual during the Chukchi 'Festival of the Young Reindeer' during which young reindeer are sacrificed....

Paul D Stewart / Illustration of Red admiral butterfly (Vanessa atalanta) life stages and parasites. By Maria Sybella Merian 1683, from her book 'Caterpillars, Their Wondrous Transformation and Peculiar Nourishment fr...

Ingo Arndt / Desert Locust (Schistocerca gregaria) life stages from larva through stages L1 to L5, Africa

Ingo Arndt / Desert Locust (Schistocerca gregaria) life stages from larva through stages L1 to L5, Africa

Sergey Gorshkov / Sockeye Salmon (Oncorhynchus nerka) at various life stages including eggs and alevins, Kamchatka, Russia

Michael & Patricia Fogden / Reticulated Glass Frog (Hyalinobatrachium valerioi) pair guarding two clutches of eggs, each at different stages of development, Costa Rica

Michael & Patricia Fogden / Reticulated Glass Frog (Hyalinobatrachium valerioi) pair guarding two clutches of eggs, each at different stages of development, Costa Rica

Jane Burton / Common Frog (Rana temporaria) two 8-week-old tadpoles at different stages of development

Jane Burton / Common Frog (Rana temporaria) tadpoles at different stages of development

Adrian Davies / Common poppy (Papaver rhoeas) in different stages of development, Devon, UK. July. Composite image.

Roland Seitre / Different life stages of the European hornet (Vespa crabro),near Tour, Central France.

Roland Seitre / Different life stages of the European hornet (Vespa crabro), near Tour, Central France.