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RE: The Bermuda petrel (Pterodroma cahow) was believed to have gone extinct in the 1620s, but was rediscovered 330 years later
Thanks for adding some extra information about them!
Yeah, the slow recovery has a lot to do with the fact that it takes a really long time for them to grow in population size. The conservationists on the islands are currently making "fake burrows" for them, since as you mention, making a natural burrow is a lot more difficult these days.