Male Frigate bird with inflated pouch, Galapagos Islands, Ecuador

Young elephant seal, Sea Lion Island, Falklands Isles, South Atlantic

Male Frigatebird with fully inflated pouch, Galapagos Islands, Ecuador

Vervet monkey displaying aggression, Zimbabwe, Africa

White-fronted tern (Sterna Striata) calling on a rock near South Head on the Tasman Sea, North Island, New Zealand

Pack of timber wolves (canis lupus) asserting hierarchy, captive