The males utter a loud succession of snorting grunts, which may be heard a mile off.

The canoe in which I was, in passing over a wounded one, elicited a distinct grunting, though the animal lay entirely under water.
The young, when very little, take their stand on the neck of the dam, and the small head, rising above the large, comes soonest to the surface.

The dam, knowing the more urgent need of her calf, comes more frequently to the surface when it is in her care.

But in the rivers of Londa, where they are much in danger of being shot, even the hippopotamus gains wit by experience; for, while those in the Zambesi put up their heads openly to blow, those referred to keep their noses among water-plants, and breathe so quietly that one would not dream of their existence in the river except by footprints on the banks..