Rolf Nussbaumer / Tricoloured heron {Egretta tricolor} on mangrove, Sanibel Is, Florida, USA

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) large male swimming to the surface amid schooling Dusky Chubs (Girella freminvillei), Cape Douglas, Fernandina Island, Galapagos Islands, Ecuador

Tui De Roy / Dusky Chub (Girella freminvillei) school feeding on Yellowfin Tuna (Thunnus albacares) carcass, Punta Albemarle, Isabela Island, Galapagos Islands, Ecuador

Pete Oxford / Dusky Chub (Girella freminvillei) school, Buccaneer Cove, Santiago Island, Galapagos Islands, Ecuador

Tui De Roy / School of King angelfish (Holacanthus passer) and Dusky chub (Girella freminvillei) gathering together, with Green turtle (Chelonia mydas) in background. Galapagos Islands, Ecuador. Pacific Ocean.

Tui De Roy / Dusky chub (Girella freminvilli) shoal, Fernandina Island, Galapagos, South America, Pacific Ocean.

David Fleetham / Dusky chub (Girella freminvillei) swimming through coral reef, Galapagos Archipelago, Ecuador.