Portrait of an Uzbek woman with gold teeth in the main food market, Samarkand, Uzbekistan, Central Asia, Asia

The Aurora Borealis (Northern Lights) display over The Devils Jaw (Devils Teeth) (Okshornan mountains), Tungeneset, Senja, Troms og Finnmark County, Norway, Scandinavia, Europe

Skull of an adult killer whale (Orcinus orca), on display inside the town of Stanley, Falkland Islands, South Atlantic Ocean, South America

Guadalupe fur seals (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Native woman at tribal gathering in Tonga, South Pacific

Traditional trolls on display in Tromso Gift and Souvenir Shop in Strandgata in Tromso, Norway

Traditional trolls on display in Tromso Gift and Souvenir Shop in Strandgata in Tromso, Norway

Traditional trolls on display in Tromso Gift and Souvenir Shop in Strandgata in Tromso, Norway

Zanzibar Red Colobus monkey, one of Africa's rarest primates

Tribesman musicians wearing war paints, feathered headdresses and necklaces made of bones and teeth playing drums and chanting during a gathering of tribes at Mount Hagen in Papua New Guinea

Zanzibar Red Colobus monkey, one of Africa's rarest primates

Two juvenile Bottlenose dolphins (Tursiops truncatus) showing teeth in socialising display, Moray Firth, Scotland.

Brown Bears (Ursus arctos), Neuschoenau wildlife enclosure, Bavarian Forest, Bavaria, Germany, Europe, PublicGround

A crocodile displays his teeth on the banks of the Nile River in Sudan.

Close-up of a Bengal tiger (Panthera tigris tigris) lying in the forest, widely yawning, Madhya Pradesh, India

Three human skulls on display on a white fence

gelada baboon portrait male baboon displaying its teeth and gums with lip flipped back threat display Simien Mountains National Park Ethiopia Africa Animals

Alaskan brown bear animals close-up of bear showing teeth threat display behaviour danger