Photographer has documented countless whale sharks the world over, but it's the 50-foot-long, bus-size pregnant females of the Galápagos he finds the most mesmerizing.
This one emerged ghostlike from the depths and slowed down just long enough for him to film the remoras hitching a ride on her tail before she vanished back into the darkness.
And as they continue pushing for expanded marine protections in the Galápagos and worldwide.