The colony of Purple Martins on Balog Island in Armstrong Park is the largest established colony of the Purple Martins in the country. The colony is housed in several apartment-style houses or “castles” on Balog Island, located on the west side of the park. The Martins have been returning to Balog Island since the mid 1970’s. Their presence and their unique needs have brought about a partnership between the Purple Martin Society and the Carol Stream Park District.

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