Photo of the Day 25 July 2008

Tiny Snails, Cuatro Cienegas, Mexico, 1995
A cluster of tiny aquatic snails sits in a freshwater pool, called a poza, in Mexico’s Cuatro Cienegas Biosphere Reserve. This isolated region, a spring-fed wetland in the middle of the Chihuahuan Desert, has given rise to some of the most uniquely adapted flora and fauna on Earth.