As a conspicuous ground-dwelling species, sandhill cranes are at risk from predators, which are probably the main nonhuman source of mortality. Mammals such as foxes, raccoons, coyotes, wolves, cougars, bobcats, and lynx hunt them given any opportunity, the first three mainly hunting large numbers of young cranes, the latter four types more rarely taking full-grown cranes in ambush excepting the bobcat. Corvids, such as ravens and crows, gulls, and smaller raptors such as hawks (largely northern harriers or red-tailed hawks) feed on young cranes and eggs. Cranes of all ages are hunted by both North American species of eagles. Mainly chicks and possibly a few adults may be preyed on by great horned owls, and even a much smaller peregrine falcon has successfully killed a adult sandhill crane in a stoop. In Oregon and California, the most serious predators of flighted juveniles and adults has been cited as golden eagles and bobcats, the most serious predators of chicks are reportedly coyotes, ravens, raccoons, American mink, and great horned owls, roughly in descending order. In Cuba and Florida, the American crocodile and alligator can take surprisingly large numbers of sandhill cranes, especially recent fledglings. Sandhill cranes defend themselves and their young from aerial predators by jumping and kicking. Actively brooding adults are more likely to react aggressively to potential predators to defend their chicks than wintering birds, which most often normally try to evade attacks on foot or in flight. For land predators, they move forward, often hissing, with their wings open and bills pointed. If the predator persists, the crane stabs with its bill (which is powerful enough to pierce the skull of a small carnivore) and kicks.