Birds
How do owls fly silently?
Big, light wings, a comb of serrations on the leading edge, soft fringes on the trailing edge and a velvety…
The field guide
Birds
Big, light wings, a comb of serrations on the leading edge, soft fringes on the trailing edge and a velvety…
Mammals
Playing dead is an involuntary reflex, not an act. How Virginia opossums survive with 50 teeth, a grasping tail, a…
Mammals
How American bison survive prairie winters: a muscular hump that powers a snow-clearing head swing, a thick winter coat, a…
Mammals
A big male Pacific walrus can weigh 1,700 kg, as much as about 19 average adult men, and stretch 3.6…
Mammals
How walruses use their tusks, hundreds of sensitive whiskers and up to 10 cm of blubber to feed on the…
Mammals
Long legs for deep snow, hollow hair, a nose that seals itself underwater and the fastest-growing antlers of any mammal:…
Mammals
Polar bears, Arctic foxes, walruses, belugas, narwhals, snowy owls and more: 13 animals that live in the Arctic, each with…
Mammals
From tiny plankton to polar bears, a clickable diagram of the Arctic food web on sea and land, and why…
Mammals
Grizzlies eat more than 266 kinds of food, from moths to elk. A clickable food-chain diagram shows who eats what,…
Birds
A bald eagle is 79–94 cm long with a wingspan of 1.8–2.3 m. Here is how it compares with golden…
Mammals
A tail with a fingerprint, hands with almost no thumb, and a diet that plants forests: how spider monkeys are…
Reptiles
Serrated jaws for grazing seagrass, salt-shedding tears and journeys of thousands of kilometres: the green sea turtle explained, including its…