RE: The Bermuda petrel (Pterodroma cahow) was believed to have gone extinct in the 1620s, but was rediscovered 330 years later

[valth]

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.