The work of an ant peculiar to the country also attracted our attention. Instead of a mound these insects made a habitation or excavation under the surface, about six feet in diameter, and it was quite smooth, level and clean, as if constantly swept. It was also nearly as hard as stone; and the only access to it was by one or two small holes. This surface was, to us, on first advancing into the interior, one of its wonders. Thus this variety of ant dwells securely at some depth below, for nothing less than a pickaxe can penetrate to the larvae; but those of another variety of the common kind which construct mounds are eaten by the native females and children, who carry wooden shovels for the purpose of digging them out. BIRDS. The bronze-wing pigeon was here as elsewhere the most numerous of that kind of bird. Next in abundance was the crested pigeon which seems more peculiar to these low levels. There were large flocks of a brown pigeon with a white head, and not an uncommon bird elsewhere; also a small species of dove with very handsome plumage. The large black cockatoo was sometimes seen, and about the riverbanks the common white cockatoo with yellow top-knot (Plyctolophus galeritus). The smaller bird of this genus with a scarlet and yellow crest and pink wings (Plyctolophus leadbeateri) was rarely noticed, and it appeared to come from a distance, flying usually very high. The pink-coloured wings and glowing crest of this beautiful bird might have embellished the air of a more voluptuous region; and indeed, from its transient visits, it did not seem quite at home on the banks of the Darling. The plumage of several kinds of parrots was extremely rich, and even the small birds were clothed in pink and blue. But the air, however much adorned by the feathered race, had its thieves, as well as the earth. The crows were amazingly bold, always accompanying us from camp to camp. It was absolutely necessary to watch our meat while in kettles on the fire and, on one occasion, notwithstanding our cook's vigilance, a piece of pork weighing three pounds was taken from a boiling pot and carried off by one of these birds! The hawks were equally voracious. A pigeon had been no sooner shot by Burnett than an audacious hawk carried it away and, as if fearless of a similar fate, he flew but a very short distance from the fowler before he had taken half the feathers off. FISHES. The species of fish most abundant in the Darling is the Gristes peelii, or cod-perch, and they are caught of a very large size by the natives. We also saw the thick-scaled mud-tasted fish (Cernua bidyana, see above). We did not on this occasion see that very remarkable fish, the Eel-fish (Plotosus tandanus) so abundant in the higher parts of the river. The water was too clear and the weather too cold for fishing with bait, one of each of the two species first mentioned caught during our first occupation of Fort Bourke, being all we ever procured.