In this photo taken May 9, 2012, Middleton Heights Elementary Principal Robin Gilbert holds a baby chick while visiting an all-girls classroom of first- and second-graders at her school in Middleton, Idaho. Middleton is believed to be the only public school in Idaho offering all-boy and all-girl classrooms, though the movement is widespread in other states and is now being targeted by the American Civil Liberties Union in a bitter struggle over whether single-gender learning should be continued. (AP Photo/Jessie L. Bonner)

Associated Press
In this photo taken May 9, 2012, Middleton Heights Elementary Principal Robin Gilbert holds a baby chick while visiting an all-girls classroom of first- and second-graders at her school in Middleton, Idaho. Middleton is believed to be the only public school in Idaho offering all-boy and all-girl classrooms, though the movement is widespread in other states and is now being targeted by the American Civil Liberties Union in a bitter struggle over whether single-gender learning should be continued. (AP Photo/Jessie L. Bonner)
In this photo taken May 9, 2012, Middleton Heights Elementary Principal Robin Gilbert holds a baby chick while visiting an all-girls classroom of first- and second-graders at her school in Middleton, Idaho. Middleton is believed to be the only public school in Idaho offering all-boy and all-girl classrooms, though the movement is widespread in other states and is now being targeted by the American Civil Liberties Union in a bitter struggle over whether single-gender learning should be continued. (AP Photo/Jessie L. Bonner)
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