How do ducks and other migratory waterfowl know then it is time to migrate south, and where do they go?
Generally, ducks, geese and other migratory birds know when it is time to migrate south due to instinct and some clues from their environment. The length of the days (photoperiod), weather conditions and reduction in food sources (because snow and ice cover the ground and water) are good indicators for the birds to begin heading south. While ducks and geese usually migrate south, some do remain in southern Canada for the winter. Those that stay in Canada stay close to areas with open water and adequate food. Depending on the species, ducks and geese migrate all over the United States, Central and South America.
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