Ⓙ — Ⓓ Months January through December, each month divided into four weeks.
▁▂▃▄▅▆▇ = Rare to widespread. Species was observed at this location and week. Size of bar indicates abundance.
▢ = No sightings. Lists have been submitted for this week at this location, but this species was not observed.
░ = Insufficient information. Species has been observed at this location, but at a different time. No lists have been submitted to confirm or deny birds presence for this specific week.
© Houghton Mifflin Harcourt Publishing Company 2015