Claire Barnett, a manager of the Bird charity RSPB, is hopeful there will be plenty more birds on the island.
“Seabird colonies can recover very, very quickly, so we’re very hopeful, and we’ve already seen some very promising signs from last year’s breeding season, that the numbers here will climb up and really secure themselves,” she says.
Removing ferrets also has benefits for the community, and means people can keep chickens without worrying their chicks or eggs might be snatched.
The island is home to Northern Ireland’s biggest seabird colony, with more than 250,000 birds, including puffins, razorbills and guillemots. It’s a popular tourist attraction.
Woody is now the island’s biosecurity dog, which means he helps the humans keep out dangerous animals and diseases.