Red kite are not the only successful reintroduction of a formerly native British species. In Scotland, the sea eagle — also driven to extinction in this country 100 or so years ago — was reintroduced in the 1990s, and have started to breed. Ospreys returned naturally to Scotland and have been reintroduced to England, after being driven extinct in the 19th century.
Perhaps more spectacularly, beavers have been reintroduced in Gloucestershire, Devon and Scotland; they had been extinct in Britain for at least 250 years. Their revival has changed the waterways around there: the dams they build filter the rivers, removing silt from the water; they create big, still pools that fish, insects and amphibians can breed in and waterbirds feed from. The Devon reintroduction saw a 1,000% increase in frogspawn levels and a growth in local bat populations (they feed on the insects that bred in the ponds). Beaver dams also reduce the risk of flooding further downstream, by breaking up the flow of the river. [...]
Ross Barnett’s marvellous book The Missing Lynx tells the story of Britain’s lost megafauna, and it gets much more dramatic than red kite and beavers. There were hyenas in Yorkshire, which coexisted with humans. There were cheetahs, and lions (the bones of which were found when Trafalgar Square was being excavated); there were giant Irish elk, six foot tall at the shoulder. Mammoth, of course. Woolly rhinos. Sabre-toothed cats. Aurochs: vast great deadly wild oxen that could look a tall man in the eye. Hippos in the Thames. [...]
Wolves are generally shy of humans. There are thousands living in Spain, Germany, France, Italy, Portugal, Norway, Denmark, Sweden, Poland, Russia and elsewhere. In some of those countries, they are protected as endangered species; in others, they are not, and in Bulgaria they have a bounty on their heads as though it were the late middle ages all over again. (In Russia, wolves in the south-east are under pressure and occasionally eaten by the increasing tiger population, because Russia is extremely hardcore.)
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