Snakes grow throughout their lives so they must replace the outer layer of scales, which does not grow, through a process called shedding. Shedding takes several days to a week to complete. You can tell a snake is ready to shed by the cloudy appearance of its eyes. Snakes are temporally blind or nearly so at this time. To shed its skin a snake will rub its head against a rock, tree or some stable object to loosen it's old skin and will then crawl slowly forward, turning this old skin inside out as it advances like when you pull your foot out of a sock.
All snakes are predators, eating meat only.
They capture their prey in one of three ways. Some catch and swallow their prey immediately. Others catch their prey, then constrict it until the animal is dead. Poisonous snakes use a toxin that immobilizes or kills their prey. Snakes can dislocate their jaw so they can swallow prey much bigger than themselves.