In this July 24, 2013 photograph, from left, Tim Preuss, wildlife biologist 

In this July 24, 2013 photograph, from left, Tim Preuss, wildlife biologist for Lake County Forrest Preserves, Lindsey Gordon and Allison Sacerdote-Velat, reintroduction biologist, carry containers of meadow jumping mice at Rollins Savanna before releasing them in Grayslake, Ill. Scientists at Lincoln Park Zoo are raising meadow jumping mice and and releasing them into the wild in an effort to help restore dwindling Midwestern prairies. (AP Photo/Scott Eisen)
Associated Press
In this July 24, 2013 photograph, from left, Tim Preuss, wildlife biologist for Lake County Forrest Preserves, Lindsey Gordon and Allison Sacerdote-Velat, reintroduction biologist, carry containers of meadow jumping mice at Rollins Savanna before releasing them in Grayslake, Ill. Scientists at Lincoln Park Zoo are raising meadow jumping mice and and releasing them into the wild in an effort to help restore dwindling Midwestern prairies. (AP Photo/Scott Eisen)
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