Thalasseus bergii
Drawn from open occurrence records in and around Blue Mountains 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. 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 Greater Crested Tern in and around Blue Mountains National Park, and the 936 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.
Table Mountain National Park, Namib-Naukluft and Dorob National Park are among eight atlas places where the Greater Crested Tern is recorded. Its records concentrate in Australia, South Africa, Taiwan, India and Namibia, and the atlas map shows these areas of focus. There are about 269,000 open records for this bird from 15 countries.
Of the 6 species with an atlas page recorded in and around Blue Mountains National Park, the Greater Crested Tern is the most recorded.
The full atlas page, and everywhere else it is recorded