In this July 24, 2013 photograph, left, reintroduction biologist Allison Sacerdote-Velat, and 

In this July 24, 2013 photograph, left, reintroduction biologist Allison Sacerdote-Velat, and wildlife biologist for Lake County Forrest Preserve Tim Preuss prepare to release a meadow jumping mouse at Rollins Savanna 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, left, reintroduction biologist Allison Sacerdote-Velat, and wildlife biologist for Lake County Forrest Preserve Tim Preuss prepare to release a meadow jumping mouse at Rollins Savanna 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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