Sorry, this episode is not currently available

Conquest of the Waters

Life on Earth Episode 5 of 13

Fish occur in populations of billions and there are over 30,000 species, more than in any other group of backboned animals. The development of the backbone was a crucial advance in evolution -and it probably came from a most unlikely source, a little jelly-like creature called a sea squirt.

Release date:

55 minutes

Last on

Sat 18 Jan 2014 09:10

Buy online

Buy online

Available on: DVD or Blu-ray

From suppliers including: Amazon DVDs,

Where to buy