wrestle, shed, feed, migrate, molt, suck, hibernate, mate, hump, birth, nurse, stand up, reproduce, suckle, ail, die, crawl, walk, wean, dominate, mark out (territory), attract (a mate), submit, injure (prey), prey, hunt, conceive, challenge (a rival), protect (position of dominance), defend (territory), give birth, push out (a calf), procreate, care for, rear (young), raise (young), mature, nourish, nurture (their young), abound, proliferate, multiply, fall ill, sicken, age