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The propagation speed of pedal waves in garden slugs and banana slugs varied substantially as the waves propagated along the animal. Wave speeds along the foot of banana slugs (black triangles) and small garden slugs (blue circles) are represented as a function of the distance from the tail of the animal, x, normalized by animal length, L (banana slugs: N=8 runs, 4 animals; garden slugs: N=25 runs, 15 animals). Data are presented as means ± s.d.
