From the article: "But the rats, which came ashore about 1900 from shipwrecks, are known to devour seabird eggs and young chicks."Never mind waste of money its a national disgrace. These animals have self-introduced and been resident for over a thousand years.
1900 is rather less than 1000 years ago. And how is escaping from shipwrecks "self-introduced"? Did the rats build the ships themselves?
Are you really incapable of seeing the difference between an introduced non-native invasive species, and a native European species of bat which flies here naturally as part of its native range?Even Nathusius's Pipistrelle - that's a self-introducer!
There are some really odd responses on this thread. The Black Rat is a highly damaging global pest species, especially on islands. It's not remotely 'rare' in terms of either its native range or its enormous global population. By the same logic, you could oppose the eradication of rats from any island on the grounds that the species would become locally extinct.