Francolins and Guinea-fowl abound along the banks; and on every dead tree and piece of rock may be seen one or two species of the web-footed 'Plotus', darter, or snake-bird. They sit most of the day sunning themselves over the stream, sometimes standing erect with their wings outstretched; occasionally they may be seen engaged in fishing by diving, and, as they swim about, their bodies are so much submerged that hardly any thing appears above the water but their necks. The chief time of feeding is by night, and, as the sun declines, they may be seen in flocks flying from their roosting-places to the fishing-grounds. This is a most difficult bird to catch when disabled. It is thoroughly expert in diving--goes down so adroitly and comes up again in the most unlikely places, that the people, though most skillful in the management of the canoes, can rarely secure them. The rump of the darter is remarkably prolonged, and capable of being bent, so as to act both as a rudder in swimming, and as a lever to lift the bird high enough out of the water to give free scope to its wings. It can rise at will from the water by means of this appendage. The fine fish-hawk, with white head and neck, and reddish-chocolate colored body, may also frequently be seen perched on the trees, and fish are often found dead which have fallen victims to its talons. One most frequently seen in this condition is itself a destroyer of fish. It is a stout-bodied fish, about fifteen or eighteen inches long, of a light yellow color, and gayly ornamented with stripes and spots. It has a most imposing array of sharp, conical teeth outside the lips--objects of dread to the fisherman, for it can use them effectually. One which we picked up dead had killed itself by swallowing another fish, which, though too large for its stomach and throat, could not be disgorged. This fish-hawk generally kills more prey than it can devour. It eats a portion of the back of the fish, and leaves the rest for the Barotse, who often had a race across the river when they saw an abandoned morsel lying on the opposite sand-banks. The hawk is, however, not always so generous, for, as I myself was a witness on the Zouga, it sometimes plunders the purse of the pelican. Soaring over head, and seeing this large, stupid bird fishing beneath, it watches till a fine fish is safe in the pelican's pouch; then descending, not very quickly, but with considerable noise of wing, the pelican looks up to see what is the matter, and, as the hawk comes near, he supposes that he is about to be killed, and roars out "Murder!" The opening of his mouth enables the hawk to whisk the fish out of the pouch, upon which the pelican does not fly away, but commences fishing again, the fright having probably made him forget he had any thing in his purse.