Page last updated at 22:39 GMT, Wednesday, 3 February 2010

Fighting salamanders: Battle of the behemoths

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The giant salamanders of Japan and China are the largest amphibians on the planet - largely unchanged since the age of the dinosaurs.

But numbers of both species are falling.

The Hanzaki Insitute, near Hyogo in western Japan, placed a camera outside the entrance to a riverbank nest, and recorded the fight between the resident male (the den-master) and a rival.

Footage courtesy of the Hanzaki Institute

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