Discovery reveals how remora fishes know when to hitch a ride aboard their hosts
(PHYSorg.com Biology)

Remoras are among the most successful marine hitchhikers, thanks to powerful suction discs that allow them to stay tightly fastened to the bodies of sharks, whales and other hosts despite incredible drag forces while traveling through the ocean. But how do these suckerfish sense the exact moment when they must `stick their landing` and board their speedy hosts in the first place?