The Pirate Crabs are a group of crabs who were acquaintances of Rockhopper which were based at Swashbuckler Trading Post. Like penguins, they were keen listeners to Rockhopper's adventures over the seas; and when the aforementioned pirate mentioned Club Penguin Island, which they appeared extremely "keen" about, they boarded the famed pirate's ship and sailed towards the island. After reaching a close proximity to the island, the pirate crabs crashed the second Migrator and invaded the island.