Rare Species by Town Viewer

We maintain a list of all documented MESA-listed species observations in the Commonwealth.

This Town Species Viewer provides the ability to:

  1. Select a town from the dropdown to see a table of which rare species have been observed in that town. The selected town will also be highlighted on the map.
  2. Select the Common Name or Scientific Name of a species to see it's distribution on the map and table showing the towns it has been observed in.

Clicking on a column header in the table will sort the column. Clicking again on the same column heading will reverse the sort order.

The Town List and Species Viewer are updated at regular intervals as new data is accepted and entered into the NHESP database.

Additional Information


  • E = Endangered
  • T = Threatened
  • SC = Special Concern

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.

Additional Resources for