Derek Gow's work is superb. Have a look at his
Rewilding Coombeshead here. Not only is Derek author of a number of books including Hunt for the Shadow Wolf: The lost history of wolves and the myths and stories and Bringing Back the Beaver: The Story of One Man's Quest to Rewild Britain's Waterways, he is also one of the Dereks in the filmdoc Derek vs Derek. The trailer is hilarious.
Watch it here. Derek has successfully introduced a number of species and is presently working on introducing the wild cat. Have a look at the Rewilding Coombeshead site for info on that project. Catch Derek on Instagram
@derekjgow