Episodes categorised as 'Factual: Science & Nature' available now on BBC iPlayer

Jonathan Dimbleby follows the Volga, which runs from above Moscow to the Caspian Sea.

9/10. A look at plants and the ingenious and manipulative ways they counter life's challenges.

Patrick Moore and Chris Lintott search for the best the winter night skies have to offer.

8/10. A look at marine invertebrates, including Humboldt squid, starfish and giant octopi.

7/10. Unique footage of a killer whale engaging in sneaky behaviour to hunt elephant seal pups.

6/10. Super slow motion shows a bombardier beetle firing boiling liquid at its enemies.

5/10. A slow-motion camera captures the unique flight of the marvellous spatuletail hummingbird.

4/10. The nature documentary looks at fish as they dominate the planet's waters.

3/10. How mammals dominate the planet through having warm blood and by caring for their young.

2/10. A look at the strategies used by reptiles and amphibians to conquer their shortcomings.

1/10. A look at how animals and plants go to extremes to give themselves a chance to breed.