The Great horned owl (Bubo virginianus) is a powerful bird (when they grow up). At the time this photo was taken in late June, these two young owls were still growing. Even at two months old they were as big as their parents although their underparts remained fluffy and downy. By late June, these owlets were still relying almost entirely on their parents for food. They were photographed near Cooke city, Montana.
Great horned owls are active mostly during the night—especially at dusk and before dawn. These birds sometimes swallow their prey whole and later throw up pellets composed of the undigested parts of their meal.