Brown Bear
Before hibernating, a brown bear can gain more than a kilogram of fat a day, then survive for months without eating, drinking or passing waste.
Mammal
Brown-throated Sloth
A sloth’s slow metabolism means a single leaf meal can take a month or more to digest completely.
California Sea Lion
California sea lions are so intelligent and trainable that the US Navy has trained them to find and mark objects underwater.
Canada Lynx
Canada lynx numbers rise and fall in a regular 10-year cycle that follows the boom and bust of snowshoe hare populations.
Capuchin Monkey
Bearded capuchins in Brazil crack nuts with stone hammers and anvils, and archaeologists have found evidence of this tool use going back about 3,000 years.
Capybara
Capybaras can stay fully underwater for up to about five minutes, and they often sleep in the water with only their noses exposed.
Caracal
A caracal can leap about 3 metres into the air and knock flying birds out of the sky with its paws.
Cheetah
A cheetah can accelerate from 0 to about 100 km/h in around three seconds, faster than most sports cars.
Chimpanzee
Chimpanzees share about 98–99 percent of their DNA with humans and make tools, including sticks shaped to fish termites out of mounds.
Clouded Leopard
Relative to its skull size, the clouded leopard has the longest canine teeth of any living cat, often compared with those of extinct sabre-toothed cats.