Weegy: Individual birds are relatively sedentary during two periods each year, at nesting time and in winter. When the entire avifauna of a continent is considered, however, during almost all periods there are some latitudinal movements of birds. [ Each species, or group of species, migrates at a particular time of the year and some at a particular time of the day. Other species are more irregular in their migratory behavior. Red Crossbills, for example, are erratic wanderers and will settle down and breed any month of the year when and where an adequate supply of conifer seeds is available. ]
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