Catharus ustulatus
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 and October, with the widest coverage in April, May, June, July, 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 Swainson's Thrush in and around Redwood National and State Parks, and the 4,268 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 and Monteverde are the two atlas parks where Swainson's Thrush is recorded, with observations concentrating in the United States, Canada, Costa Rica, Ecuador and Colombia. The atlas contains about 889,000 records of this bird across seven countries. Because the map shows where these records concentrate, it reflects a partial view of the species range.
Of the 13 species with an atlas page recorded in and around Redwood National and State Parks, the Swainson's Thrush is the 3rd most recorded.
The full atlas page, and everywhere else it is recorded