To use this map
- Select a species from the drop-down menu in the upper left corner. All towns that the species has been observed in will be highlighted on the map. The accompanying table will also show information about the rare species, as well as the complete list of towns with their most recent observation years.
- Click on a town in the table to highlight it on the map.
- Click on a town in the map to load a table that shows all of the rare species observed in that town.
Clicking on a column header in the table will sort by that column. Clicking again on the same column heading will reverse the sort order. Toggle between basemaps by clicking the image on the bottom right corner of the map.
This map is updated at regular intervals as new data is accepted and entered into the Natural Heritage and Endangered Species Program's database.
Find rare species in Massachusetts by town.
Most recent observation
This field represents the most recent observation of that species in a town. However, because they are rare, many MESA-listed species are difficult to detect even when they are present. Natural Heritage does not have the resources to be able to conduct methodical species surveys in each town on a regular basis. Therefore, the fact that the 'Most Recent Observation' recorded for a species may be several years old should not be interpreted as meaning that the species no longer occurs in a town. However, Natural Heritage regards records older than twenty-five years historic.
For more information about a particular species, view the list of Natural Heritage fact sheets.