If you ask to use the restroom at the Wild B.I.R.D. Information and Rehabilitation Center of Denver, you'll have some company, since you'll have to share with a duck taking a bath or a cormorant preening before the mirror.
On the day of my visit, there were about 240 birds at the center - most of them sick or injured and a few who just couldn't find enough to eat over the winter and needed a little R&R before being released. Lodgings range from incubators to paper towel-lined baskets to large habitats, or "flights." There is no caste system here - chickens, ducks, great blue herons, snowy egrets, grebes, western tanagers and pigeons ("the most maligned bird," according to my tour guide, Judi Vietmeyer) all receive the same level of care.