After watching them for some time, I wished to retire and let them amuse themselves undisturbed; but Quambo took it into his head to give a loud shout, when in an instant the startled creatures scampered off, and dived under the water.  Our chance of seeing more of them was gone; they were evidently on the watch for us, for now and then I saw a snout popping up above the surface, to ascertain if we had taken our departure.