Get the Hitchhikers Guide
Download an electronic copy of the guide in PDF format.
This is a large (1.7MB) download, which may take a long time over slow connections.
If you don't already have it, you will need
Adobe Acrobat Reader to view this file.
If you would like a paper copy of the guide, email your request to:
or contact Judith Pederson at the address below.
Search for Exotic Species
Go to the beach, look under a dock, or check out what's growing
anywhere along the edge of the water or underneath it, and see if you can find any of the species pictured in the
Hitchhikers Guide, or in our
Verify Species Identification
To provide us with useful information, follow the instructions on the
Verification Instructions Page.
Submit your Exotic Species Sighting
If you have seen a marine exotic (also known as non-native, invasive, and bioinvader), please report it via the "Hitchhiker's Guide to Exotic Species" link on the home page of our Marine Invader Tracking Information System.
View Hitchhiker sightings Online
To see maps of hitchhiker sightings and other sightings of non-native species, go to our
Exotic Maps Page.
Note that your sighting submission will not be immediately available to view on the maps. We will add it once
the sighting and species identificaiton have been verified, which could take some time.
For more information on the Hitchhikers Guide, or our Invasive Species programs, please contact:
MIT Sea Grant College Program
292 Main Street, Bldg E38-300
Cambridge, MA 02139