The “Impluvium d’Evian" Ramsar Site provides an important habitat for invertebrates, in particular for two butterfly species, the Large Heath Butterfly and the Cranberry Fritillary, whose populations are in decline everywhere else in the region. Different species of orchids, such as the Fen Orchid, can be found. The latter is also threatened by the increase in abundance of invasive species such as the Japanese Knotweed.