Then they dived into their den; and after sniffing about and whimpering lonesomely for a while, they curled themselves up close together and went to sleep.

It had been a strange and dreadful day.
"As you may imagine, these two youngsters had never yet been trained to the useful habit of sleeping with one ear open.

They had left that to their parents.

But to-night, even while they slept most soundly, something within them seemed to keep watch.

Whatever it was, suddenly it woke them.