The BBC reports that Red swamp crayfish have been found in London's Regents Canal. Like the Signal crayfish this is an American invader that threatens to oust the smaller native crayfish, though it's not such a big-clawed lobster as the Signal.

The BBC reports that Red swamp crayfish have been found in London's Regents Canal. Like the Signal crayfish this is an American invader that threatens to oust the smaller native crayfish, though it's not such a big-clawed lobster as the Signal.