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.