Picture Of The Week - A Swarm In The Sea

This photograph, which was taken in 2010, captures a bit of animal behavior that has rarely (if ever) been seen before or since it was taken. German photographer Florian Schulz snapped the image while flying over Baja California Sur in Mexico. It's a mass of Munkiana Devil Rays, swimming toward an unknown destination.

Of the photograph, Schulz said: "Not even my pilot, who has surveyed this area for 20 years, had seen anything like it. As we got closer we started to discover its nature: an unprecedented congregation of rays. The group was as thick as it was wide, all heading towards the same direction. I have asked around why this took place but no one has been able to explain it to me."

The photograph earned him the CIWEM Environmental Photographer Of The Year Award in 2012.