Claudio Contreras / Cortez rainbow wrasse (Thalassoma lucasanum), San Agustin Bay, Huatulco Bays National Park, southern Mexico, November

Claudio Contreras / Cortez rainbow wrasse (Thalassoma lucasanum), Cabo Pulmo National Park, Sea of Cortez (Gulf of California), Mexico, July

Henley Spiers / Giant damselfish (Microspathodon dorsalis) male, protecting its nest during breeding season from attack by hungry Cortez rainbow wrasse (Thalassoma lucasanum) initial phase and one in terminal phase,...

Claudio Contreras / Cortez rainbow wrasse (Thalassoma lucasanum) swimming over coral. Huatulco Bays National Park, Oaxaca state, Mexico, Pacific Ocean. November.

Joel Sartore / Photo Ark / Cortez rainbow wrasse (Thalassoma lucasanum) male close-up side profile, Downtown Aquarium, Denver, Colorado, USA. Captive.