THE DIGESTIVE SYSTEM OF THE JUMPING SPIDER
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The spider's digestive system flows throughout its entire body. The venom the spider injects into the insect is digestive fluid. That digestive fluid then makes the insect(s) into "liquid form"/juice, then the spider slurps up its prey. They have peristaltic stomachs. That basically means their stomachs are like straws.
(1). http://en.wikipedia.org/wiki/Jumping_spider