"A Monarch Butterfly which has died is trimmed for flight and flown as a walkalong glider. The butterfly was found with its wings in the folded position. The butterfly is put in a humid chamber to loosen up the muscles. Once unfolded, the butterfly wings are dried in a mold and fingernail polish is applied to the fuselage to add weight and strengthen the wings. The butterfly is then flown as a walkalong glider."
http://www.instructables.com/id/Monarch-Butterfly-Walkalong-Glider/