Eight legged creature capable of spinning webs to trap prey.
"You mean you eat flies?" gasped Wilbur.
"Certainly. Flies, bugs, grasshoppers, choice beetles,
moths, butterflies, tasty cockroaches, gnats, midges, daddy
longlegs, centipedes, mosquitoes, crickets - anything that is
careless enough to get caught in my web. I have to live,
"Why, yes, of course," said Wilbur.
[ Charlotte's Web, by E.B. White ]