Grampus griseus
Drawn from open occurrence records in and around Channel Islands 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, July and September, with the widest coverage in September. 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: 4 squares of 25 km carry records for Risso's Dolphin in and around Channel Islands National Park, and the 85 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 is the single atlas park where the Risso's Dolphin is recorded. Its records concentrate in the United States, Taiwan, France, Portugal, and Mexico. There are 8,501 records of this mammal across 16 countries, and the map shows where these records gather.
Of the 10 species with an atlas page recorded in and around Channel Islands National Park, the Risso's Dolphin is the 9th most recorded.
The full atlas page, and everywhere else it is recorded