Stelgidopteryx serripennis
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 March, April, May, June, July, August and October, with the widest coverage in March, April, May, June, July, August 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 Northern Rough-winged Swallow in and around Shenandoah National Park, and the 3,311 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 atlas park where the Northern Rough-winged Swallow is recorded, with records concentrating in the United States, Canada, Mexico, Costa Rica and Guatemala. The atlas holds about 1.1 million records of the bird from eight countries, and the map follows where these records concentrate. Records are seasonal, peaking from March to September. The months with the fewest records are January, February, November and December.
Of the 9 species with an atlas page recorded in and around Shenandoah National Park, the Northern Rough-winged Swallow is the 4th most recorded.
The full atlas page, and everywhere else it is recorded