* Other seabirds: Frigatebirds, skuas, and gulls are all known to prey on blue-footed booby chicks and eggs.
* Sharks: Blue-footed boobies are also vulnerable to attack by sharks when they are swimming or diving for fish.
* Marine mammals: Seals, sea lions, and dolphins can all prey on blue-footed boobies.
* Humans: Humans are also a threat to blue-footed boobies, as they are sometimes hunted for their feathers or meat.