The Blackburnian Warbler is a striking fireball that has always been one of the most targeted warblers of spring. It is a dweller of old growth forests, particularly large stands of old growth hemlock – hence its nickname. The construction of the Sleeping Bear Heritage Biking Trail in Glen Arbor opened up previously inaccessible stands of old growth forest that lie at the base of Alligator Hill. The Trail is perhaps one of the finest areas in Michigan to see a significant presence of Blackburnian Warblers as well as other canopy dwellers like the Black-throated Green Warbler. In fact, these two birds dominate the sounds of the forest and the two mile stretch from Glen Arbor west to the campground. The forest here has a significant presence of large old growth hemlock and white pine which is the preferred habitat for these birds. In the middle section in particular, you can often hear and see upwards of 15 to 20 individual birds. The Trail can be accessed in Glen Arbor from S. Forest Haven Dr.