sentences:  For seabirds, colonies on islands have an obvious advantage over mainland colonies when it comes to protection from terrestrial predators.Other situations can also be found where bird colonies avoid predation.A study of yellow-rumped caciques in Peru found that the birds, which build enclosed, pouch-like nests in colonies of up to one hundred active nests, situate themselves near wasp nests, which provide some protection from tree-dwelling predators such as monkeys.