Fish abound, as do waterfowl, crocodiles and, in the southern swamps, hippopotami.
The fauna also is well represented, but tigers which once were frequently seen are now very scarce; panther, hyena, jackal, wild boar, deer (Cervus maral) are common; pheasant, woodcock, ducks, teal, geese and various waterfowl abound; the fisheries are very productive and are leased to a Russian firm.
Southward, the Danube encircles a vast fen, tenanted only by waterfowl and herds of half-wild swine, while the plain which extends to the north-east and east only grows fertile at some distance inland.
Waders and waterfowl are far less abundant, and those occurring are nearly all migratory forms which visit the peninsula of India - the only important exception being two kinds of solitary snipe and the red-billed curlew.
Waterfowl are numerous and the forests of the warm valleys are filled with song-birds and birds of beautiful plumage.
Birds are very numerous, including no fewer than 4 varieties of crows, 5 of warblers, 7 of woodpeckers, 8 of buntings, 4 of falcons, and 5 of eagles; while among the hosts of waterfowl which people the marshes of the Danube are 9 varieties of ducks, and 4 of rails.
Long, crowded by waterfowl not known before in that desert country.
Other features of these parks are a small botanical garden in Cwmdonkin, a good collection of waterfowl in Brynmill, and a small aviary of the rarer British birds in Victoria Park, which also has a meteorological station in connexion with the meteorological office, and a statue of Mr William Thomas of Lan erected in 1905 in appreciation of the work done by him in preserving and obtaining "open spaces" for Swansea.
The reeds are cover for waterfowl of various kinds, which the traveller sees in great numbers, and wild boars are found in the marshes to the south.
Of waterfowl, the Canada goose (Branta canadensis) is naturalized to a small extent in Britain, and also, to a less degree, the Egyptian goose (Chenalopex aegyptiacus); the latter bird also occurs wild in New Zealand.
The avifauna, with the exception of waterfowl, is also limited to comparatively few species.