UPDATED: SEPT. 13, 2012
Vehicles aren't the only users of the Zoo Interchange. The monarch butterfly uses the path in Wauwatosa's own county grounds and runs along the northeast side of US 45. In fact, their flight is underway now.
According to the Friends of the Monarch Trail:
"The Monarch Migration is so unique; it has been deemed an endangered biological phenomenon.
The migratory stopover in Wauwatosa at the County Grounds is one of only a few known sites in southeastern Wisconsin. The annual monarch migration in North America is considered to be the most famous and astonishing example of insect migration
Monarch butterflies come from the north and Canada. Many of them stop at this site. Here they feed on nectar plants to gain strength for their long journey to Mexico. The geographical features drive them to this location with its perfect elevation and the habitat that sustains them. When the wind currents are just right, the monarchs take flight and continue their 2,500 mile journey, taking part in this international Monarch Migration."
WisDOT has worked with Milwaukee County Parks and the Friends of the Monarchs to enhance the butterfly habitat near the County Grounds and other locations within the Zoo Interchange Project. Enhancements consist of planting milkweed and other nectarine plants to augment the typical roadside landscaping. The pilot project will be monitored by to determine the long-term benefits of the approach.