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 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.
This change is due to the decline of horseand cattle-rearing in the llanos, partly in consequence of political disturbances and partly of a murrain which broke out in 1843 among horses, mules and asses.