Alaskan children like to keep a lookout for that “first robin” of spring. While some scientists say robin’s spring migration follows the northward creep of 36ºF average temperatures, others believe the availability of food plays a greater role than temperature. Indeed, some Alaskan communities find robins sticking around for the winter foraging for left-over berries. While most robins do migrate south, some also stay, usually during milder winters.