Fears over wild beaver disappearance
1 November 2015 Last updated at 01:23 GMT
There is concern that England's only wild beavers have disappeared.
The animals, which were first sighted on a Devon river in 2013, have not been seen since September.
One local wildlife film maker fears human visitors may have scared them away.
Jemma Woodman reports.
You can see more on this story on Inside Out South West on BBC One on Monday 2 November at 19:30 and later on the BBC iPlayer.