Pete Oxford / By-the-wind-sailors (Velella velella) stranded on beach, North Stradbroke Island, off Queensland coast, Australia

Norbert Wu / By-the-wind Sailor (Velella velella) siphonophore allows the jellyfish to float and the sail catches the wind, California

Richard Herrmann / Ocean Sunfish (Mola mola) predating By-the-wind Sailor (Velella velella), San Diego, California, sequence 4 of 4

Richard Herrmann / Ocean Sunfish (Mola mola) predating By-the-wind Sailor (Velella velella), San Diego, California, sequence 3 of 4

Richard Herrmann / Ocean Sunfish (Mola mola) predating By-the-wind Sailor (Velella velella), San Diego, California, sequence 2 of 4

Richard Herrmann / Ocean Sunfish (Mola mola) predating By-the-wind Sailor (Velella velella), San Diego, California, sequence 1 of 4

Martin Camm / Carwardine / Illustration of Jack-by-the-wind Sailor / Jack sail-by-the-wind (Velella velella) (Wildlife Art Company).

Luis Quinta / By-the-wind sailor (Velella velella) colony, portrait, Portugal, Atlantic Ocean.

Luis Quinta / Violet snail (Janthina janthina) feeding on By-the-wind sailor (Velella velella) colony, Portugal, Atlantic Ocean.

Luis Quinta / Violet snail (Janthina janthina) feeding on By-the-wind sailor (Velella velella) colony, Portugal, Atlantic Ocean.