Background info --cobra Snakes usually feed on small mammals, birds, re tiles or fish. Some snakes, like cobra, are poison ous and can kill with a single bite. Boas($#)suff ocate(使窒息) their prey by wrapping tightly aro und itBackground info --- cobra • Snakes usually feed on small mammals, birds, re ptiles or fish. Some snakes, like cobra, are poison ous and can kill with a single bite. Boas(蟒) suff ocate (使窒息) their prey by wrapping tightly aro und it