A pair of jellyfish, Copula sivickisi, mating. In this cuboza species, the male (right) drags a female (left) through the water before pulling her in close and using his tentacles to pass a sperm packet to her tentacles. She then eats that sperm.
Jelly-Riding Crab Photograph by Hannah Johnson, A crab clings to its floating host as both are swept out to sea near Wrightsville Beach, North Carolina. One role jellyfish play in the marine ecosystem is the transport of other animals across the ocean.