Chlidonias hybrida
Drawn from open occurrence records in and around Udawalawe 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, September, October, November and December, with the widest coverage in January, February, March, April, May, 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: 1 square of 25 km carry records for Whiskered Tern in and around Udawalawe National Park, and the 606 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.
iSimangaliso Wetland Park, Ngorongoro Conservation Area and Table Mountain National Park are among the nine atlas places where the Whiskered Tern is recorded. Its records concentrate in Taiwan, India, Australia, Spain and Thailand, and the map shows where these records gather. The atlas holds about 290,000 open records of this bird from 32 countries.
Of the 2 species with an atlas page recorded in and around Udawalawe National Park, the Whiskered Tern is the most recorded.
The full atlas page, and everywhere else it is recorded