The Connecticut River watershed encompasses a large, diverse area. As a result, there are a great number of species which occur here; approximately 59 species of mammals, 250 birds, 22 reptiles, 23 amphibians, 142 fish, 1,500 invertebrates and 3,000 plants.

• Connecticut River Watershed Species Discussion
• List of Amphibians and Reptiles of the CT River Watershed
• List of Birds of the CT River Watershed
• List of Fishes of the CT River Watershed
• List of Mammals of the CT River Watershed