Eggs and juvenile robins that still live in the nest are eaten by squirrels and snakes. Some birds also eat eggs and juvenile robins. When feeding together in flocks, American robins will watch each other for signs of predators. If a predator is seen, they will make a warning call. Sometimes, the Brown-headed Cowbird lays its eggs in the robin's nest. This is called brood parasitism. The robin usually rejects the cowbird eggs. Because of this, brood parasitism by the cowbird is rare.