The mountainous group of Beigua is one of the areas richer of biodiversity of Liguria, thanks to its particular position on the Appennino watershed and near the sea.
On the ridges we can find meadowlands and thin shrubby beeches, an unusual environment, where we can find also rare species of alpine plants, like the star of the Alps and the Bertoloni viola, that tolerates the content of magnesium of the serpentiniche cliffs of this area.
Along the enough steep side, you can meet hardwood forests, unfortunately impoverished from fires and cutting: in the past the trees of these valleys have been exploited as raw materials in order to produce coal and as fuel in order to gain salt from the seawater. The vegetation, however thriving, is composed from ilex, roverelle, ornielli, kernels and reforestation of black and sylvan pine, ecologically versatile, as well as shrubs like heather and alaterno. In this territory the wild boar, sturdy and prolific, and the roe, with its characteristic bark, find a very favourable environment. Other small mammalian are the vixen, the rate, the hare, the curl and the squirrel, that - contrary to the likeable dormouse - does not go into hibernation, but it limits himself to make an abundant food provision and to exit rarely from the comfortable nest. The nocturnal predators, like owl and the tawny owl live among these trees.
With regard to forests, it’s important to remember that the territory of the Comunità Montana Argentea comprises, between the municipalities of Arenzano and Cogoleto, the Regional State Forest "Lerone", that hold the wonderful fluvial valley, hollowed from the homonymous torrent.
In spring the diurnal predators cross the Lerone valley, during the flight that lead them from Africa towards the north-oriental Europe, where they nest: they are the pern, the duck-hawk, the kite, the harrier eagle. In this valley the predators - that feed often on reptiles, amphibious and fish - do not run sure the risk to remain without prey: besides the coluber, aggressive but inoffensive, they find the common viper and the natrix, near torrents and small lakes they meet the temporary frog, the toad, the salamander and the crested triton, in the fresh and oxygenated waters of the streams the trout and the barbel swim. In the shade of the trees other characteristic species of the serpentino bloom, like the spleenwort and the odorous daphne, than from April to June render the excursion distances still more evocative.
Coming down towards the sea, you enter in the Maquis, kingdom of the small birds - finch, robin, nightingale - difficult to see while slip in among the branches of the bushes of strawberry-tree and juniper.