MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY MATTHEW OLDFIELD / SCIENCE PHOTO LIBRARY
Sleeping butterfly fish with night markings. This is Klein's butterfly fish (Chaetodon kleinii). Most fish that use bright markings and colours to signal during the day will often change colour at night, taking on red or brown hues to make them less visible to predators. Photographed in Manokwari harbour, West Papua in Indonesia, Asia.
Model release not required. Property release not required.