Birds aren't the only animals that can be seen at Montrose. In early fall, numbers of migrating Monarch butterflies use the trees and shrubs to rest before continuing south. For a few days in September of 2003, there were literally thousands of these showy black and orange butterflies at Montrose. Monarchs can also be seen flying over Montrose, somewhat akin to migrating raptors. Large numbers of Painted Lady butterflies can also be seen during migration in the spring and fall. Several different species of bats are regular during fall migration in late August and September. The best time to see these volant mammals is in the early morning when they're coming in off of Lake Michigan after a night of migration. Unfortunately for the bats, the local Peregrine Falcons prefer to hunt them over birds. Terrestrial mammals that have been observed at Montrose include White-tailed Deer, Raccoon, Red Fox, Coyote, Muskrat, Beaver, Eastern Chipmunk, and Opossum.. For a small park in the middle of a large city, the diversity of wildlife found at Montrose is truly impressive.
