Many accounts are incomplete although new information is being added continuously.
Errors do occur.
Users are cautioned to refer back to the original cited source to assess completeness and correctness before using the information. Web updates are intermittent, not continuous, therefore some dynamic information such as legal status may not be absolutely current. They are casual farther north and are considered rare to fairly common and local. According to the 1987 and 1990 bird checklists of Bosque del Apache NWR, the seasonal abundance of swamp sparrows has increased notably. Swamp sparrows are winter migrants in the Gray Ranch, Hidalgo county, New Mexico.