For Endangered Species Day, celebrated annually on the third Friday of May, we"re featuring the whooping crane, one of only two crane species found in North America. Once seen throughout midwestern North America, whooping cranes were driven perilously close to extinction by the early 1940s, with fewer than two dozen birds in the wild. Thanks to conservation efforts, their numbers have now risen to more than 600. While that"s good news, this limited recovery is still fragile, and these incredible creatures remain imperiled, particularly by the loss of their wetland habitat.