Killing beavers may become necessary to control their numbers if the animals were formally reintroduced to Scotland, according to a new report.

Beavers have been released in Knapdale, in Argyll, in a trial project.

A wider programme of releases in the future could, in some places, see the animals causing problems by damaging trees and crops, the report said.

The authors of the study said healthy beaver populations in Germany were controlled through hunting.

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