Naked Mole-rat
Naked mole-rats can live for more than 30 years, over ten times longer than similar-sized rodents, and rarely get cancer.
Mammal
Narwhal
The narwhal’s spiralling tusk is actually an enormous tooth that grows through its upper lip and may contain millions of nerve endings.
Nine-banded Armadillo
Nine-banded armadillos almost always give birth to identical quadruplets, all developing from a single fertilised egg.
North American Beaver
A beaver dam in Wood Buffalo National Park, Canada, is about 850 metres long, one of the largest structures ever built by an animal other than humans.
North American River Otter
River otters love to slide down muddy or snowy banks on their bellies, and they seem to do it just for fun.
Numbat
The numbat eats up to about 20,000 termites a day, licking them up with a sticky tongue about 10 cm long.
Ocelot
In the 1960s and 1970s, about 200,000 ocelots were killed every year for the fur trade, before international bans allowed populations to recover.
Olive Baboon
Olive baboons form long-term friendships, and studies in Kenya have shown that a baboon’s social position affects its stress levels and health.
Orca
Orcas are the largest members of the dolphin family, and different populations have their own diets, hunting methods and ‘dialects’ that are passed down through generations.