5/11A giant clam on the coral floor. This unique species is found to be a wide variety of colours, created by a contrast between algae inside the clam and the clams natural pigment. This vibrancy is an indicator of clam healthif the clam is unhealthy, the dying algae will bleach it to a bright white. Giant clams, when healthy, can live up to 100 years and weigh up to 200kgs.Credit:James Brickwood