The wealth of ornithological species, especially in winter, has made the Lame di Fuori Reserve one of international importance.

A multitude of black-headed gulls, herring gulls (now Yellow Legged Gulls) and terns frequent the water's edge. Towards the interior, commonly occurring Anatidae are: Teal, Shoveler, Gadwall, Pintail, Wigeon and Mallard, the last being the only duck to nest in the area.

Pittima reale
Curlew, Lapwings and Greylag Geese (Anser anser) occur on the meadows at the Arno mouth.

During migration, throngs of waders can often be seen in the belt adjacent to the water's edge; among them the Redshank, Black-tailed Godwit, Whimbrel and Ruff all deserve special mention.

The Lame di Fuori meadows are also ideal feeding grounds for Fallow Deer and Wild Boar.

Of the "lesser fauna" the area boasts remarkable populations of two species of amphibians which elsewhere are dwindling in number: the Tree Frog  (Hyla intermedia) and the Green Toad (Bufo viridis).