Calidris alba
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 January, February, March, April, May, June, July, August, September, October, November and December, with the widest coverage in January, February, March, April, May, July, August, September, October, November and December. 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 Sanderling in and around Olympic National Park, and the 6,069 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.
West Coast National Park is the atlas place where the Sanderling is recorded, with records gathering most thickly in the United States, Canada, Portugal, the United Kingdom, and Norway. The atlas holds about 997,000 open records of this bird across 14 countries. Because the map follows where these records concentrate, it represents a partial view of the bird's full range.
Of the 20 species with an atlas page recorded in and around Olympic National Park, the Sanderling is the 9th most recorded.
The full atlas page, and everywhere else it is recorded