- The Hairy Click Beetle is only found on the river bank in Tintern and the River Parrott on the English side of the Severn. It lives on tidal reeds which are only marginally in salt water.
- Dragonflies and damselflies and molluscs (including six species of mussel) can be found along most of the river length. In the estuary, brackish water supports other species of molluscs (including a nationally rare snail) and crustaceans such as the Atlantic stream crayfish.
- Insect Walks