A sucker-like structure on top of the head of a remora allows it to attach to sharks by creating a partial vacuum.

“The remora is a relative of the perch which habitually attaches itself to the belly of a shark using a specialized, corrugated, suckerlike structure on top of its head; this in fact develops from its dorsal fin. The remora is thus carried like a hitchhiker as the shark swims through the sea.” (Shuker 2001:163)

Last Updated August 18, 2016