The site contains 25 species of butterfly and 15 dragonfly and damselfly species, which include the nationally scarce varieties of silver-studded blue (Plebejus argus) and blue-tailed damselfly (Ischnura pumilio).
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The SSSI is predominantly situated on Devonian sandstones and shales, with the area around St Agnes formed from Grampound grit.
head | head of state | Beavis and Butt-head | Agnes | Alec Head | Murray Head | Head Start | Anthony Head | Head Start Program | Diamond Head | Human head | Head teacher | Machine Head (band) | Machine Head | Head Over Heels | Head of the River Race | Eddie the Head | Ágnes Heller | Hilton Head Island, South Carolina | Edith Head | Diamond Head (band) | Beachy Head | Agnes Monica | The Bodley Head | Lizard Head | Head & Shoulders | Head over Heels (Paula Abdul album) | Head over Heels | Diamond Head, Hawaii | Agnès Varda |