Ruby-throated Hummingbirds are still migrating through here in southern NH. Here's one I just photographed feeding at the Salvia Lady in Red blossoms in a planter on our deck. Note the whitish forehead, which is pollen from flowers. Rubythroats help pollinate flowers by carrying this pollen from one plant to another. Keep your hummingbird feeders filled with fresh nectar, during this migration time and usually by mid-to-end of Sept. here, they will all be gone.