Ever wondered how the beaches that humans almost worship got so sandy? Well you can thank the humphead parrotfish whose jaws crush coral reefs and even stones, the result is that sand.

You need to login to download this video.
or login or signup

Channels: Ecology Geophysics

Tags: Feeding humphead parrotfish Blue Planet BBC

Upload by: topeto on 26-11-2011.

Duration: 2m 20s

Dnatube: Sciencific and Medical video site.