Giant undertaking

Cold-blooded Galápagos tortoises bask on volcanic vents to warm themselves. They weigh up to a quarter of a tonne and their heavy shell makes mating difficult. To stop the males falling off during the lengthy mating process, they have evolved a concave underside to their shell, which fits on to the convex top of the female's shell. The males call as the pair mates.

Release date: 21 Sep 2009

3 minutes

Credits

Role Contributor
Key talentDavid Attenborough
Key talentDavid Attenborough

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