The wikipedia page on Fredkin & Toffoli's billiard ball computer[0] mentions a 2011 paper Robust Soldier Crab Ball Gate[1] co-authored by Andrew Adamatzky of th

The wikipedia page on Fredkin & Toffoli's billiard ball computer[0] mentions a 2011 paper Robust Soldier Crab Ball Gate[1] co-authored by Andrew Adamatzky of the Unconventional Computing Centre: "Soldier crabs Mictyris guinotae exhibit pronounced swarming behavior. Swarms of the crabs are tolerant of perturbations. In computer models and laboratory experiments we demonstrate that swarms of soldier crabs can implement logical gates when placed in a geometrically constrained environment." [0]https://en.wikipedia.org/wiki/Billiard-ball_computer https://en.wikipedia.org/wiki/Billiard-ball_computer [1]http://wpmedia.wolfram.com/uploads/sites/13/2018/02/20-2-2.pdf http://wpmedia.wolfram.com/uploads/sites/13/2018/02/20-2-2.p...