Image for Walrus tusks

Walrus tusks

Duration: 02:18

Walrus tusks can be over a metre in length, but the key to their feeding technique can be found in their skull.

Available since: Tue 11 Mar 2014

This clip is from

Secrets of Bones Food for Thought

5/6 Ben uncovers the secrets of how vertebrates capture and devour their food.

First broadcast: 18 Mar 2014

Image for Food for Thought Not currently available on BBC iPlayer

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