you need the spiders to eat the flies,
cats and spiders are on the same team.

Our cats used to leave the bottom halves of rabbits. One of them once took down a sparrowhawk. Also a weasel, the cat was in a bit of a state after that but the weasel was dead.
( Moon Girl Technologies don't take my word for anything, Tue 3 Jul 2012, 21:14, Reply)