“Ah, that fellow is the fishing-eagle of Africa—the Halicetus vocifer” said David. “His piercing eye observed his prey when he was yet far up in the air. See how like a meteor he descended on it! Now he flies away to yonder rock; and there, see! he has begun to tear his fish to pieces. How quickly he has finished it—and listen to that curious shriek he is uttering, and how oddly he moves his head and neck. It is answered from those other rocks. The birds are calling to each other, and from this the fishing-eagle has gained his name of vocifer” Leo was for shouting and making them fly off. “No, no; let them feed,” said David. “We have frightened the flamingo once; and how would you like to be disturbed in your dinner? We must get Kate to come and look at them.”

While we were watching the birds, an enormous head emerged from the water at a short distance from us. Leo and Natty, who were a little in front, started back, Leo exclaiming, “What can it be? What a terrific monster!” A huge body rising after the head, the creature swam slowly up the stream.

“Why, that must be a hippopotamus,” observed David, watching the creature in his usual calm way.

“It looks to me the size of an elephant,” exclaimed Leo. “Run, run, run! If he were to attack us he would swallow us up in a mouthful.”

“I do not think it has even noticed us,” said David. “It will be time enough to run when the creature lands. See! there is another.”

As he spoke, a second and then a third hippopotamus appeared, following the first. The creatures, indeed, had truly terrific countenances; their backs in the water looking, as Leo had declared, nearly as large as those of elephants.

“But see, there are some other creatures nearer!” cried Natty. “Oh, what are they? What fearful jaws!”

He pointed to the bank close below us, and there we saw, just scrambling out of the water, three huge crocodiles. There was no mistaking them. We knew at once by their long snouts and terrific jaws, their scaly backs and lizard-like tails, their short legs and savage eyes. They seemed in no way afraid of the hippopotami, which they kept watching as they swam by.

“I little expected to get a sight of these monsters,” said David. “But see! they take no notice of us, and we need not be afraid of them.”

I had my gun, and instinctively levelled at the head of the nearest hippopotamus.