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How mammals dominate the planet through having warm blood and by caring for their young. (R)
A look at the strategies used by reptiles and amphibians to conquer their shortcomings. (R)
A look at how some animals and plants go to extremes to give themselves a chance to breed. (R)
A look at marine invertebrates, including Humboldt squid, starfish and giant octopi.
Natural World investigates the vital bond between animal mothers and their babies.
Unique footage of a killer whale engaging in sneaky behaviour to hunt elephant seal pups.
Super slow motion shows a bombardier beetle firing boiling liquid at its enemies. (R)