U.S. Marine Corps photo by Kelly O'Sullivan/Released 150930-M-ZZ999-587.JPG
Oct 1, 2015
Dr. Brian Henen, an ecologist with the Combat Center's Natural Resources and Environmental Affairs Division, counts the growth rings on CM-4, a wild male desert tortoise, that entered an open outer gate at the installation's Tortoise Research and Captive Rearing Site on Sept. 30, 2015. Henen counted 25 rings, but estimated the tortoise is 40-years-old. The desert denizens live an estimated 80 to 100 years in the wild. (Official USMC photo by Kelly O'Sullivan/Released)
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