For the next two hours, in spite of misty fog and light rain, we stood and watched scads of warblers move through the trees and shrubs. It was probably the biggest congregation of warblers that I've seen in the last twenty years. It was hard to focus on single birds, as others would flit through in the backdrop and it was tempting to follow each new bird. Multiple species were often in close proximity in the same tree. As one big wave would dissipate, another group would come along after a brief lull. At peak times, dozens of birds would be in view, flitting maniacally through all levels of the forest picking off midges and other insects. It was impressive, to say the least.
In all, we saw 21 species, and many of them in large numbers. Getting exact estimates was tough, because it was impossible to glass all of the birds as they moved through in the misty dim conditions. For many species, probably dozens of birds passed by. For those interested, here's what we saw:
Cape May Warbler
Black-throated Blue Warbler
Black-throated Green Warbler
Such occurrences are probably not that uncommon along this part of the Lake Huron shoreline. You've just got to be in the right place at the right time.