Hirundo rustica
Drawn from open occurrence records in and around Olympic 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, June, July, August and September, with the widest coverage in April, May, June, July, August and September. 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 Barn Swallow in and around Olympic National Park, and the 8,970 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.
The Okavango Delta is the atlas park where the Barn Swallow is recorded, and its records concentrate most in the United States, Canada, Finland, Belgium and Luxembourg. This bird has about 3.2 million open records from 22 countries, and the map shows where these records concentrate.
Of the 20 species with an atlas page recorded in and around Olympic National Park, the Barn Swallow is the 5th most recorded.
The full atlas page, and everywhere else it is recorded