'Very chill' wild beaver filmed on river after return of species to UK after 400 years / Farmer risked everything fighting for Scotland's wild beavers / Wild beavers to make a comeback in England / Why beavers are being released into the English wild for the first time in centuries / England allows wild beaver releases in 'milestone' for UK nature / Beaver to be allowed in England wild for first time in centuries to stop flooding / Beaver releases into wild to be allowed in England for first time in centuries / Beavers build 'ideal' habitat for endangered native voles / Beavers create habitat suitable for water voles in Scottish rainforest / Beavers in Cairngorms for first time in 400 years