There is a big heated debate about the whole Beaver re-introduction programme. They look cute, they have many positive affects but not all feel the same.
There are a lot of controversies on re-introductions in the UK.
The Wolf and Lynx re-introductions are very heated subjects. Can man and domestic livestock live with these predators when BOP's, Gulls, Ravens, Fox, Stoats are regularly killed/culled.
The White-Tailed Sea Eagle re-introduction was a success in Scotland and may now shift to East Anglia. Can you imagine birds dubbed "flying barn doors" in the lowlands, not too far from London, wandering possibly even into London LOL!
The deliberate release and feral breeding of Eagle Owls in the UK - should they or should they not be here but as the debate rages the population is building up!
Then you have the successes:-
Red Kites - once a tiny population left in Wales now re-introduced around Oxfordshire, Nottinghamshire, the NE of England, Leeds area, S W scotland and the North of Scotland - a huge success!
Great Bustards - disappeared over 100 years ago bred for the first time this year after many attempts at their release site in Salisbury
3 Cranes - naturally re-colonised east anglia and spreadto some other areas but still re-introductions taking place to secure their future.