- Piping Plover
- Roseate Tern
- Red Wolf
- New England Cottontail
- Northern Long-eared Bat
- Eastern Cougar
State Endangered Species in Connecticut
- American Bittern
- American Eel
- Brook Floater (mussel)
- Eastern Box Turtle
- Frosted Elfin (butterfly)
- Gopher Tortoise
- Hellbender (salamander)
- Hine's Emerald Dragonfly
- Little Brown Bat
- Loggerhead Sea Turtle
- Maritime Ringlet (butterfly)
- Monarch Butterfly
- Northern Cricket Frog
- Northern Dusky Salamander
- Northern Map Turtle
- Ocellated Salamander
- Pickerel Frog
- Piping Plover
- Red-bellied Cooter
- Roseate Tern
- Seabeach Amaranth
- Short-eared Owl
- Smooth Green Snake
- Spotted Turtle
- Swamp Darner (dragonfly)
- Three-toed Box Turtle
- Tricolored Heron
- Wood Turtle