Cardellina pusilla
Drawn from open occurrence records in and around Redwood National and State Parks, 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, September, October and November, with the widest coverage in April, May, June, July, August, September, October and November. 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 Wilson's Warbler in and around Redwood National and State Parks, and the 5,411 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, Monteverde and Manuel Antonio are the three atlas places where Wilson's Warbler is recorded, with records concentrated in the United States, Canada, Mexico, Costa Rica and Guatemala. The atlas holds about 970,000 records of the bird from eight countries, and the map shows where these sightings concentrate.
Of the 13 species with an atlas page recorded in and around Redwood National and State Parks, the Wilson's Warbler is the 2nd most recorded.
The full atlas page, and everywhere else it is recorded