flyway-map-bio

North American flyway map. In summer months, birds from each region of the continental U.S. mix in far northern Canada, swapping viruses before returning to their wintering grounds further south.

North American flyway map. In summer months, birds from each region of the continental U.S. mix in far northern Canada, swapping viruses before returning to their wintering grounds further south. Map courtesy U.S. Fish and Wildlife Service

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