Shane Gross / Sergeant major damselfish (Abudefduf saxatilis) shoal. Nassau, Bahamas.

David Fleetham / Hawaiian sergeant (Abudefduf abdominalis), male guarding eggs at nesting site. Hawaii.

Tim Fitzharris / Wrasse (Labridae), Surgeonfish (Acanthurus sp), and Sergeant Major Damselfish (Abudefduf saxatilis) school, Negros Oriental, Philippines

Tim Fitzharris / Sergeant Major Damselfish (Abudefduf saxatilis) and Parrotfish (Scaridae) school, Negros Oriental, Philippines

Tim Fitzharris / Scissor-tail Sergeant (Abudefduf sexfasciatus) and Wrasse (Labridae) school, Philippines

Tim Fitzharris / Parrotfish (Scaridae), Damselfish (Chromis sp), Sergeant Major Damselfish (Abudefduf saxatilis), Basslet (Pseudanthias sp), and Anemonefish (Amphiprion sp) school, Bohol Island, Philippines

Tim Fitzharris / Parrotfish (Scaridae), Butterflyfish (Chaetodon sp), and Scissor-tail Sergeant (Abudefduf sexfasciatus) school, Negros Oriental, Philippines

Tim Fitzharris / Green Sea Turtle (Chelonia mydas) and Sergeant Major Damselfish (Abudefduf saxatilis) group, Negros Oriental, Philippines * composite image *

Linda Pitkin / Sergeant major (Abudefduf vaigiensis), shoal on wreck of the Kingston, near Shag Rock, Strait of Gubal, Egypt, Red Sea.

Linda Pitkin / Sergeant major (Abudefduf vaigiensis), shoal on wreck of the Kingston, near Shag Rock, Strait of Gubal, Egypt, Red Sea.

Alex Mustard / Sergeant major (Abudefduf saxatilis) male cleans his nest, with purple eggs visible behind, wreck of the Kittiwake. Seven Mile Beach, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Matthew Maran / Vigrate rabbitfish (Siganus virgatus), Sergeant bengalenses (Abudefduf bengalensis) Surf Parrotfish (Scarus rivulatus) swimming near the surface, Koh Tao, Thailand, October 2013.