How does an octopus walk? Why do snails have shells? Zoey investigates a variety of soft-bodied invertebrates - including leeches! -- to find out how “squishy animals” get along without bones.

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“What would we look like without bones?” MY GREAT CHALLENGE: It’s a slug race!Challengers cover themselves in slime and compete to see who’s the fastest “slug.” IN THE FIELD: At the aquarium, Zoey handles jellyfish and meets an octopus that can squish itself into tight spaces.