We were lucky enough to be taken out on an early morning swim with Manta Rays at Barefoot Manta resort in Fiji. Mantas are filter feeders, and these ones regularly come into a fast-flowing channel between two islands to feed. They often do this in small groups, looping and gliding around each other to find the tastiest currents in the channel.
This NZ fur seal off Montague Island in Australia was incredibly inquisitive, swimming around us, peering at our lights and reflective domes, even picking up and playing with an inadvertently discarded weight pocket from a previous diver. In this shot he's checking out the anchor line of our dive boat.