This has got to be one of the weirdest computers ever devised by man: crab-powered computing.
New Scientists explains:
Although you're unlikely to ever stop by the Apple store to pick up the latest iSnap model, it turns out that swarms of soldier crabs herded through tunnels can form the AND, OR and NOT logic gates required to make a computer.
Yukio-Pegio Gunji of Kobe University in Japan and colleagues realised that when two swarms of crabs collide, they merge and continue in a direction that is the sum of their velocities. This behaviour means the researchers could adapt a previous model of unconventional computing, based on colliding billiard balls, to work with swarms of crabs, with 0s and 1s represented by the absence or presence of a swarm.