A peregrine is a fairly common type of raptor, or hunting bird. While peregrines are about the size of a crow, they are much fiercer predators.
You can also call a peregrine a peregrine falcon. In falconry, the training of hawks and falcons for hunting, peregrines are popular. These birds are found everywhere on earth with just a few exceptions. The word peregrine has a Latin root, peregrinus, "coming from foreign parts" — these birds tend to be caught during migration rather than taken from the nest. Peregrine is also used to simply mean "migratory" or "foreign."