If you’ve taken college biology, you may be familiar with the humble planarian, a primitive animal consisting of little more than a thin sheet of tissue with a minimal nervous system. Most species inhabit water, but a few can be found slithering on dry land, and these nearly brainless creatures are sometimes carnivorous. Various land planaria live off a diet of earthworms, which they dissolve into mush with the secretion of a digestive enzyme.
9. Katydids
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