Snorkeling in Kona, Steve Jurvetson captures a swarm of reef hebivores so thick that you can barely see the substrate. While the Yellow Tangs and Convict Tangs are very obvious, look closely. You'll see Unicorn Tangs, Achilles Tangs, White Cheek Tangs, Orange Shoulder Tangs, and buried in the chaos, a Guttatus Mustard Tang, the Hawaiian Humbug Damselfish, a Moorish Idol, a possible Brown Surgeonfish, and probably even more. Image by Steve Jurvetson | CC-BY-2.0