Heisler's Dairy Bar is the landlord to 100 breeding pairs of purple martins (Progne Subis). We have 14 purple martin houses on our grounds. Each year the birds arrive in April and spend the season at Heisler's. They depart for Central America in Mid August after fledging many young martins. Our colony of martins began in 1965 with one house and has grown to 14 today. The birds only consume flying insects which they catch in flight and are known for their beautiful morning song. For more martin info, please see www.purplemartin.org.