Why does my cat eat spiders?
Reason 3: Spiders Are a Great Source of Taurine
Cats also might eat spiders because they are a high source of taurine, an essential amino acid that cats get primarily from live food sources in the wild. Is it okay if my cat eats a spider? In most cases, eating a spider will cause no harm at all to your cat. Most spiders are not dangerous and even the venomous ones will have their venom digested before it can cause a problem.