Setophaga pensylvanica
Drawn from open occurrence records in and around Shenandoah National Park, aggregated onto a 25 km grid. A cell is matched by its centre, which can sit up to 16 km outside the boundary, so this covers the surrounding country too.
Occurrence records measure where people looked and found something, which is not the same as where the animal is. This is a relative likelihood, not a probability.
Records exist for April, May, August, September and October, with the widest coverage in April, May, August, September and October. A quiet month can mean the animal was absent, or that nobody was looking.
A grid cell is a square of the map, not a sighting: 1 square of 25 km carry records for Chestnut-sided Warbler in and around Shenandoah National Park, and the 1,888 records behind them were collected by other people and published openly. Nothing here counts animals, and a place with more records is not always a place with more animals.
Arenal, Osa Peninsula and Manuel Antonio are among the six atlas places where the Chestnut-sided Warbler is recorded. Its records concentrate in the United States, Canada and Costa Rica, with further presence in Panama and Honduras. The atlas holds about 788,000 records of this bird from seven countries, and the map shows where these sightings gather most frequently.
Of the 9 species with an atlas page recorded in and around Shenandoah National Park, the Chestnut-sided Warbler is the 8th most recorded.
The full atlas page, and everywhere else it is recorded