Wild beavers 'destroying flood defences' in Tayside
22 May 2014 Last updated at 09:48 BST
Wild beavers became extinct in Scotland sometime during the 18th century as a result of over-hunting, but the rodent has recently been spotted in several Perthshire rivers.
While they have been welcomed by conservationists, farmers say they are causing thousands of pounds' worth of damage.
The Scottish government is now considering what to do about them.
BBC Scotland Correspondent James Cook reports from Tayside.