It depends largely on the prey type..insect predators that feed on soft prey such as ladybeetles eat them up completely (though the feeding habits are as in all other insects not really good and often often parts and leftovers fall down )
But all more sturdy and hard food is rarely consumed completely independent from predator or prey species....such prey is often prepared by biting off wings and legs, sometimes even the head.
Anyway some ground beetles, praying mantis I guess also eat up their prey often more or less completely, with the above limitations.
One must presume that long and short arguments contribute to the same end. - Epicurus
...except casandra's that did belong to the funniest, most interesting and imaginative (or over-imaginative?) ones, I suppose.