Amphibians
The salamander that never grows up
Famous in aquariums, rare in the wild: the axolotl keeps its gills for life and can regrow limbs, eyes and even parts of its brain.
Animals
Remarkable creatures, from the deep sea to the far north.
Mammals
Seeing the night with sound
Many bats find their way and catch insects in the dark by listening to the echoes of their own calls — most of them too high for us to hear.
Birds
Fathers of the long winter night
Emperor penguins breed in the Antarctic winter. The males keep the egg warm for weeks without eating — and survive by standing together.
Insects
The dance that tells bees where to fly
In the dark of the hive, a returning bee dances out a map: the direction of the flowers, and how far away they are.
Birds
How a hummingbird survives the night
By day its heart beats around 1,200 times a minute. On a cold Andean night it can drop to 40 — and its body to just above freezing.
Mammals
The giants that sing and hunt with bubbles
Humpback whales cross oceans, build nets out of air and sing songs that never stay the same for long.
Insects
The butterfly that outlives its parents by months
Several short-lived generations fly north each summer. Then one special generation flies thousands of kilometres south — and lives for months.
Invertebrates
The animal that can switch life off
Tardigrades are smaller than a grain of sand. When their world dries out, they shrivel into a ‘tun’ — and wait, sometimes for years.
Mammals
The sea otter’s warm secret
No blubber, cold water and the densest fur of any mammal — plus an appetite that shapes a whole forest.
Invertebrates
Three hearts and a mind in every arm
Blue blood, colour-changing skin and most of its neurons in its arms: meet the world’s largest octopus.
Birds
The bird that chases daylight
A seabird under 125 grams flies between the Arctic and the Southern Ocean every year. Trackers showed how far.
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