I remember that Grandsir Billy said that they heard it "garp" several times; I suppose he meant yawn.

The circumstance seems rather strange.

He said that it "garped" like a big dog every time it sharpened its claws.

Yet it did not cease to watch the little inclosure.
At last, tired with watching the boys fell asleep, a circumstance that is not strange perhaps when you consider they had plodded fifteen miles that day and had carried heavy loads.
They slept for some time.

From later events the boys could infer what took place outside the hut.