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1. GoQBot: a Bio-inspired Rolling Robot - View video
    
2. NSF's "Science Nation video" - View video
    
   
3. Internal tissue movements in a crawling caterpillar are clearly visible in Calpodes which has a transparent body wall. The gut slides forward ahead of the body wall each time the crawl begins. Filmed by Barry Trimmer in Costa Rica at 60 fps.
   
   See also - Simon, M. A. et al. (2010). Visceral-locomotory pistoning in crawling caterpillars. Curr Biol 20, 1458-63.