And so, if “there are no birds in last year’s nest,” as mourns a doleful poem, you need not be sad on that account, for if you look closely, you may find, now and then, a mouse in last year’s nest--and who will say that finding a mouse in a bird’s nest is not almost as interesting as finding a bird there? A robin’s nest in the winter-time would be the wettest, muddiest, coldest place in the world for a robin; but a mouse can take that old robin’s nest and turn it into a snuggery (if you know what a “snuggery” is) so cozy and warm that neither the tip of Mr. Mouse’s sharp nose, nor the tip of his thin ears, nor the tippy-tip of his long bare tail ever feels one sharp nip of the cold outside. So, if there are no birds in last year’s nest (as surely there ought not to be), take your tongs and tap, or, better, climb up, and reach gently into the nest with your finger, for a mouse may be waiting inside to bite you,--and that would be interesting. For a mouse is interesting--just as interesting in his mousy ways as a whale in his whalish ways, or a robin in his ways. Can you name anything that does not grow interesting as soon as you begin to watch and study it? Large things, small things, Bengal tigers or earthworms--all things will surprise and interest you if you will study them for a season. I have a friend, for instance, who has shot more tigers, in more lands, than any other living man; who knows more about tiger habits and the tempers of the dangerous beasts than any other man; and who, as I am writing this, is himself writing a book which is to be called “Tiger Lands.” That will be an exciting book, no doubt, for he has had adventures that made my hair stand up on my head, just to hear about. Yet I very much doubt if that book, with all its man-eaters, will be any more interesting or any more valuable to us than Darwin’s book on earthworms. So am I going to sigh because there are no birds in last year’s nests? Had the poem said, “there are no _mice_ in last year’s nests,” that might have made me sad, perhaps; though I am sure that I could go into the woods almost any winter day and find plenty of old _stumps_ with mice in them. And I am equally sure that there will be plenty of birds in next summer’s nests; so, until the robins come back and build new nests, I am going to look out of the window these dark December days, and think of White-Foot in Robin’s old nest, high up there in the slender sapling, where no cat can climb to him, and where no crow will dare come to tear his house to pieces. [Illustration: “THERE HE WILL SWING IN THE WINTER GALES”]