This subspecies is listed as vulnerable. The Pealei peregrine is listed as vulnerable within Canada. Peregrine falcons are expert hunters feeding on songbirds, shore birds, waterfowl, sea birds and pigeons, all of which are caught in flight. The peregrine is anatomically specialized for hunting by direct pursuit in open areas. The prey often tries to escape by gaining altitude but the peregrine uses its speed to stay above the prey, and then dives, killing the prey by a direct blow of the closed fist.
Pairs are sometimes cooperative when hunting during the breeding season.
Peregrines, and particularly the Arctic peregrines, occasionally prey on small mammals such as lemmings. On the wintering grounds, peregrines predominantly prey on migratory shore birds. In the breeding season, falcons nest on a cliff ledge, cliff top, a ledge or top of the tallest building is also preferred, preying on pigeons in nearby parks. Occasionally peregrines may nest on the ground. Eggs are incubated for 32 days, mainly by the female, while the male hunts for food.