Southern elephant seal (Mirounga leonina) mating behavior on South Georgia Island, Southern Ocean

Male Frigate bird with inflated pouch, Galapagos Islands, Ecuador

Giant tortoise feeding on leaves on the Galapagos Islands

Land iguana camouflaged among cactus plants, Galapagos Islands, Ecuador

A giant tortoise feeding on leaves and a bird on the Galapagos Islands

Marine iguana on the rocks, Galapagos Islands, Ecuador

The back foot of a giant tortoise on the Galapagos Islands

Giant tortoise feeding on leaves on the Galapagos Islands

Darwin Finch bird feeding while on a rock, Santa Cruz, the Galapagos Islands, Ecuador

DarwinFinch bird, Santa Cruz, the Galapagos Islands, Ecuador

Marine iguanas on the beach, Galapagos Islands, Ecuador

Giant tortoise feeding on leaves on the Galapagos Islands

Land iguana camouflaged among cactus plants and feeding on leaf, Galapagos Islands, Ecuador

Land iguana , Galapagos Islands, Ecuador

Male Frigatebird with fully inflated pouch, Galapagos Islands, Ecuador

Giant tortoise feeding on leaves on the Galapagos Islands

Land iguana , Galapagos Islands, Ecuador

Marine iguana on the rocks, Galapagos Islands, Ecuador

Darwin Finch bird, Santa Cruz, the Galapagos Islands, Ecuador

Giant tortoise feeding on leaves on the Galapagos Islands

Land iguana camouflaged among cactus plants, Galapagos Islands, Ecuador

Marine iguanas on the beach, Galapagos Islands, Ecuador

Darwin Finch bird perched on branch, Santa Cruz, the Galapagos Islands, Ecuador

A bee orchid, Yorkshire Dales, Yorkshire, England, United Kingdom, Europe

Prehistoric Man, Stone Age Cave Dweller

A geologic time scale shows major evolutionary events from 650 million years ago to the present.

Habituated group of mountain gorillas (Gorilla beringei beringei), Bwindi Impenetrable Forest National Park, being studied by scientists from the Max Planck Institute for Evolutionary Anthropology Leipzig, image showing "Happy", male baby, born September

Habituated group of mountain gorillas (Gorilla beringei beringei), Bwindi Impenetrable Forest National Park, being studied by scientists from the Max Planck Institute for Evolutionary Anthropology Leipzig, image showing "Matu", female, Ruhija, Uganda, Afr

Habituated group of mountain gorillas (Gorilla beringei beringei), Bwindi Impenetrable Forest National Park, being studied by scientists from the Max Planck Institute for Evolutionary Anthropology Leipzig, image showing "Thursday", female baby, born Septe

Habituated group of mountain gorillas (Gorilla beringei beringei), Bwindi Impenetrable Forest National Park, being studied by scientists from the Max Planck Institute for Evolutionary Anthropology Leipzig, image showing "Marembo", oldest blackback of the

Habituated group of mountain gorillas (Gorilla beringei beringei), Bwindi Impenetrable Forest National Park, being studied by scientists from the Max Planck Institute for Evolutionary Anthropology Leipzig, image showing "Marembo", oldest blackback of the

Habituated group of mountain gorillas (Gorilla beringei beringei), Bwindi Impenetrable Forest National Park, being studied by scientists from the Max Planck Institute for Evolutionary Anthropology Leipzig, image showing "Kabandiize", young male, born Sept

Habituated group of mountain gorillas (Gorilla beringei beringei), Bwindi Impenetrable Forest National Park, being studied by scientists from the Max Planck Institute for Evolutionary Anthropology Leipzig, image showing "Kikyokyo", female baby, born Augus