Sign up for free

Newsletters

Once a month
get new photos
and expert tips.

Photography
Main Photo Galleries Wallpapers Photo of the Day Photographers Photo Tips Buy Prints

Delaware Horseshoe Crabs, Delaware Bay, 1999

"Horseshoe crabs were once ground up by the millions for fertilizer. Now their blood is used to detect contamination in drugs and medical equipment. Humans have begun to grasp the staggering variety and value of life on Earth just as we push many species toward extinction."

—From "Biodiversity," February 1999, National Geographic magazine

Photograph by Frans Lanting