Made up of a mosaic of natural habitats rare in Pays de la Loire (peatlands, dry heathland, oligotrophic ponds, alder-birch stands), this is a major site for biodiversity and constitutes one of the last refuges for certain species of heritage interest.
The flagship species on the Auvours military site are:
- Oblong-leaved sundew (Drosera intermedia)
- Elongated sedge (Carex elongata)
- Vagrant darter (Sympetrum vulgatum)
- Dartford warbler (Sylvia undata)