“Nemo,” Matteo Visconti — Ishigaki Island, Okinawa, Japan

“The relationship between the ocellaris clownfish that dwell among the tentacles of Ritteri sea anemones is a good example of mutualism,” Visconti says. “The territorial fish protects the anemone from anemone-eating fish, and in turn the stinging tentacles of the anemone protect the clownfish from its predators.”