Bonaire, 2008 – The juvenile French Angelfish, Pomacanthus paru, had taken up residence in a piece of wreckage, turning the unsightly structure into a cleaning station – a location that fish know they can visit to have parasites removed. Shrimps and fishes that make their living picking parasites and injured tissue from other fish are known as cleaners. We knelt in the sand for about half an hour, watching bar jacks buzz in for a quick visit. The angelfish would turn its attention to us when there were no client fish to clean, but abandoned us as soon as a real target appeared.