Migration: To escape intense competition in the tropics, several hummingbird species migrate to the U.S. and Canada to breed each spring. It is amazing ... Ideally feeders should be hung where they can be observed, but also in areas that are safe and accessible to hummingbirds. ... Hummingbirds can become hypothermic if they drink very cold sugar water while they are perching. ... Observe birds feeding and measure how much nectar has been consumed from each type of feeder.