Swans, geese and ducks (fam. Anatidae)
Several species are reported, some of which are present only occasionally.
Among swans, the mute swan (Cygnus olor) has been repeatedly noted; are also known tworeports for the month of December of the rare whooper swans (Cygnus cygnus).
The occasional presence of geese (gen. Anser), which are almost always marked with flocks in transit.
The presence of ducks, a few years ago limited in the area due to the absence of large areas with water free from vegetation, was favored by the environmental restoration work carried out in the area, by creating pools of water with variable tranches suitable to accommodate both dabbling ducks (linked to shallow water) and those diving (in need of deeper waters). Most of the species frequents resurgence environments during migration and in general with limited amounts and for short periods.
The mallard (Anas platyrhynchos) is most common duck, widely distributed in the region, all year round and breeding. In the area of the resurgences is fairly common although the observation in nature it is not always easy because habits are elusive, especially during the breeding season.
Among the other species noted in particular the garganey (Anas querquedula), a small duck easily observed during migratory movements, which are known to nest on the ground. Other dabbling ducks found on a regular basis are the common teal (Anas crecca) and northern shoveler (Anas clipeata), among divers a mention goes to the tufted duck (Aythya fuligula) and the ferruginous duck (Aythya nyroca).