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1:17
Male swiftlets use their own building material, gluey saliva, to make their nests.
1:23
Scientists compare wolf pups living outside Chernobyl with those living inside the zone.
1:19
Przewalski's horses have been released in the zone, to restore the land's biodiversity.
2:13
A once thriving metropolis is now green, in an unnerving and unintentional way.
1:23
A family of bison ward off a pack of wolves as they begin to feed on a fallen calf.
1:35
Arctic foxes use a special pouncing technique known as ‘moussing’
1:46
The pronghorn antelope's speed may be due to an arms race with the American cheetah.
6:05
This segment examines a battle between two male koalas for territorial dominance.
