if you're using "swarm of birds", why not use "flock of birds" too? flock could be unupped and swarm could be upped, cuz i think flock sounds milder than swarm.
well, if a wolf is hunting something and catches it, why would it continue? isn't it full?
also, i think snakes do, and i imagine snakes emphasize the "devour" concept better (because some can unhinge its jaw and swallow its prey whole)