Raccoon ("Procyon lotor") tracks and scats abound on all divisions. Their sign most often appears along the edges of tidal creeks and salt pannes, where they search for green crabs and small fish. Care must be taken to distinguish raccoon sign from that of river otters ("Lutra canadensis"), another mammal that forages extensively in the marshes. River otters are observed infrequently in the salt hay along the edges of tidal creeks. Most recently, river otters were seen in the Merriland River and Branch Brook in the Upper Wells Division.