Alex Mustard / Large female Giant Pacific Manta Ray (Manta birostris) swimming below surf crashing into Roca Partida, Revillagigedos Islands, Mexico. East Pacific Ocean. February

Alex Mustard / Giant Pacific Manta Ray (Manta birostris) portrait with Remora fish (Echeneididae) Roca Partida, Revillagigedos Islands, Mexico. East Pacific Ocean. February

Alex Mustard / A young Whaleshark (Rhincodon typus) less than 5m in length, 'botella' feeding on plankton near the surface, by hanging vertical in the water like a bottle. La Paz, Mexico. Sea of Cortez. October

Alex Mustard / A young Whaleshark (Rhincodon typus) less than 5m in length, 'botella' feeding on plankton near the surface, by hanging vertical in the water like a bottle. La Paz, Mexico. Sea of Cortez. October

Alex Mustard / A young Whaleshark (Rhincodon typus) less than 5m in length, feeding on plankton near the surface. La Paz, Mexico. Sea of Cortez. October

Alex Mustard / Giant Pacific Manta Ray (Manta birostris) swimming below surf crashing into Roca Partida, Revillagigedos Islands, Mexico. East Pacific Ocean. February