Children take aim at invasive species
Kristal Walsh, natural/cultural resources manager of 1st Special Operations Civil Engineer Squadron, shovels as Hurlburt Field Youth Center children place a PVC pipe frog house near a creek outside the base child development center at Hurlburt Field, Fla., April 6, 2012. The Cuban tree frog, an invasive species, are attracted to these types of houses, which will be used to monitor the frog's population. (Courtesy photo)