Sergio Hanquet / Scorpionfish (Scorpaena maderensis) resting cmouflaged on rock. Tenerife, Canary Islands.

Sergio Hanquet / Scorpionfish (Scorpaena maderensis) resting. Tenerife, Canary Islands.

David Hall / Blackfoot firefish (Parapterois heterurus), blue stripes on pectoral fin when threatened, on gravel. Pantar, Alor Archipelago, Indonesia.

David Hall / Blackfoot firefish (Parapterois heterura), blue striped pectoral fins displayed as a response to threat. Pantar Island, Alor Archipelago, Indonesia.

David Hall / Shortsnout scorpionfish (Scorpaenopsis obtusa) camouflaged against sea floor. Pantar, Alor Archipelago, Indonesia.

David Hall / Blackfoot firefish (Parapterois hetururus) on gravel. Pantar, Alor Archipelago, Indonesia.

Tony Wu / Bluestreak cleaner wrasse (Labroides dimidiatus) cleaning Luna lionfish (Pterois lunulata). Shizuoka Prefecture, Honshu, Japan. June.

Magnus Lundgren / Wild Wonders of China / Zebra lionfish, or zebra turkeyfish (Dendrochirus zebra) venomous species, Xiaoliuqiu Island, Taiwan

Pascal Kobeh / Madeira rockfish / Scorpionfish (Scorpaena maderensis) in front of squid eggs, Canary Islands

Pascal Kobeh / Madeira rockfish / Scorpionfish (Scorpaena maderensis), Canary Islands

John Shaw / Pacific spotted scorpionfish (Scorpaena mystes) at Puerto Ayora fish market, Santa Cruz Island, Galapagos Islands. May.

Shane Gross / Spotted scorpionfish (Scorpaena plumieri) camouflaged on a sponge, The Bahamas.