Much of inland Erris is covered with blanket bog. A triangle between Ballycroy, Bellacorick and Bangor Erris consists of little else over its surface. Blanket bog, unlike raised bog, grows slowly across the landscape like a blanket covering the ground, due to a continuous supply of water from rainfall, maintaining waterlogged conditions on the ground. The bog is acidic with a pH of between 3.5 and 4.2. This is Atlantic blanket bog and it provides a suitable habitat for many species of flora, particularly small species of mosses, bryophytes, carnivorous plants and delicate flowers such as the scarlet pimpernel. Species of fauna found on Atlantic blanket bog, include smaller varieties such as frogs and insects as well as many bird varieties, not common elsewhere.