They also help rid the stationary cnidarians of harmful parasites and chase away predators like butterflyfish. Here's a rare example of mutualism in the United States.: coyotes and badgers.
If you plan on visiting Napili, make sure you bring your snorkel gear. Napili's reefs conceal a wide array of butterflyfish, not to mention a sizable sea turtle population. (Just note that it is ...
If snorkeling and diving are on the agenda, look for the 900+ fish species that live and thrive in these waters, including raccoon butterflyfish, Moorish idols, pufferfish, damselfish, and parrotfish.