The shallow lagoons of the llanos, like those of the Argentine pampas, are favourite fishing grounds for these birds.
The llanos have some distinguishing characteristics.
The Llanos de Urgel, which comprise the greater part of southern Lerida, are extensive plains forming part of the Ebro valley, but redeemed by an elaborate system of canals from the sterility which characterizes so much of that region in Aragon.
The latter is known as the llanos of the Orinoco, a region described by Humboldt as a vast " sea of grass," with islands of wood scattered here and there.
Appun's visit in 1850 trees seem still to have been comparatively rare; but a different aspect was presented when Dr P. Jonas visited the llanos in 1878.