Setophaga tigrina
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 January, April, May, August, September and October, with the widest coverage in April, May, 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: 2 squares of 25 km carry records for Cape May Warbler in and around Shenandoah National Park, and the 3,101 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 is the single atlas place where the Cape May Warbler is recorded, with records gathering most thickly in the United States, Canada, the Bahamas, Cuba and the Cayman Islands. The atlas holds about 369,000 open records of this bird from nine countries, and the map follows where they concentrate.
Of the 9 species with an atlas page recorded in and around Shenandoah National Park, the Cape May Warbler is the 5th most recorded.
The full atlas page, and everywhere else it is recorded