Whalesucker

Found singly or in pairs, either free swimming, or attached to their host (with a sucker on top of their head) most often attached to spinner dolphins, or other porpoises and whales.
They feed on scraps of food, parasites and vomit, from their hosts.

Remoras have a sucker on top of their heads to attach to anything that moves!
They spend their days Hitch hiking between large fish such as sharks, manta rays, turtles etc.
They are quite keen to hitch a lift with divers as well.
If they do attach push forward to remove!
They feed on scraps of food from their hosts or parasites on their hosts.