These Frigate Birds are huge with a wingspan that can reach 6 feet.. They nest on one of the nearby keys called Long Key and the whole time we were at the fort there were 20 or 30 of them soaring over the fort and around the island. They cannot take off from water and snatch prey from the ocean surface or beach using their long, hooked bills. They catch fish, baby turtles and other birds' chicks in this way. Frigate birds will rob other seabirds of their catch, using their speed and maneuverability to outrun and harass their victims until they drop their catch, hence their nicknames of "Man of War birds" or "Pirate birds".