I discovered this adorable video today and thought you might enjoy it. While this is an Anna's Hummingbird that isn't found in Maine, she looks similar to our Ruby Throated Hummingbird and builds a similar nest.
I once found a hummingbird's nest tucked into the branches of an evergreen tree located near a school. It was made with twisted hair that I assume it gathered from hair the young ladies had discarded from their brushes.
I am told that my great grandmother cautioned her daughters never to empty the brush and let the hair fly in the wind because birds would use it to build nests and you would get a headache. While the headache part is questionable, birds will, and do, use hairs found outside to build or line their nests.