Short-Distance and Long-Distance Migrants Comparing Robins and Hummingbirds Student Record Sheet Robins Ruby-Throated Hummingbirds Spring migration patterns and timing   Click for migration map comparison activity Main factors that prompt them to migrate * Availability of food * "Good" weather (Daylength plays small role.) * Daylength (photoperiod) Main winter food     Main breeding season food     How do they know their migration route?     Ability to survive cold temperatures     Average weekly temperature when they arrive in your neighborhood.     How many miles per day can they fly?     How high do they fly?     Possible migration hazards     Other comparisons