Other fauna and flora reintroduced to Britain
1) Natterjack toad
This handsome amphibian - distinguished from the common toad by the yellow stripe down its back and its loud, ratchet-like call - is currently confined to sand dunes and heaths in north-west and south-east England. Over the past five years Natterjacks have been released at four sites in Cumbria, where they may well benefit from a milder climate as a result of global warming.
2) Cirl bunting
Once found across southern Britain, this rare relative of the yellowhammer has retreated to its final UK stronghold, the south Devon coast. Birds from the thriving Devon population are now being released in nearby Cornwall, however, and have already bred successfully. The next step is to return them to traditional farmland throughout southern England and Wales.
3) Water vole
Britain's fastest-declining mammal badly needs a helping hand, and is being released at suitable sites throughout the country. However, the inspiration for Kenneth Grahame's Ratty will only thrive if the non-native North American mink is kept under strict control.
4) Lady's slipper orchid
Famous as Britain's rarest flowering plant - represented by a single specimen at a secret site in the Yorkshire Dales - the lady's slipper orchid is now being bred in a laboratory at Kew Gardens. In the longer term, it is hoped to reintroduce the orchid throughout its former range.
5) Freshwater pearl mussel
Following a steep decline, caused by pollution of rivers, habitat loss and a reduction in fish populations, this unique shellfish is currently being raised in captivity in the hope that it can be reintroduced into selected rivers in England and Scotland.
6) Field cricket
By 1990, loss of its grassland habitat meant that this once-familiar insect was confined to a single site in West Sussex. But thanks to a captive breeding programme run by Natural England in partnership with London Zoo, the field cricket has now been returned to six sites in south-east England.
One of our favourite mammals, the dormouse has suffered in recent years from the loss of coppiced woodlands and hedgerows, and has vanished from much of its former range. Since 1994, a combination of woodland restoration and careful reintroductions has allowed the population to begin to recover.
8) Fen ragwort
Once found in wet ditches throughout East Anglia, this perennial plant seemed to have become extinct in the mid-19th century due to the drainage of the fens. Then, in the 1970s, a single specimen was discovered in a ditch beside a busy main road in Cambridgeshire. Seeds were taken from this original plant, and the ragwort was reintroduced to five fenland sites, including Woodwalton and Wicken Fens, where it now thrives.