Gripping the ice with his sharp claws, the polar bear leaned over the edge of the ice, sniffing the air and taking in the foreign scent of the 50 sweaty, sunburnt tourists, expedition leaders and crew.

BBC: Life in the fragile, frozen Arctic

While the first felines of the 1950s were ferocious, with yellow eyes and sharp claws, by the 1960s they had a playful, cublike look.

WSJ: The Sublime Cats of Cartier

The cats have big, sharp claws and white fangs.

NEWYORKER: Town of Cats