Eager Beavers

Reports that a 'wild' (aka 'escaped') family of European beaver have been filmed on the river Otter in Devon (http://www.theguardian.com/environment/2014/feb/27/wild-beavers-england-devon-river). I am not certain if this is a 'good thing' because, although the beaver was certainly found in the UK several hundred years ago, things have changed dramatically since. They may well do interesting things with water meadows but I suspect that their activities are not necessarily linked to human considerations.