To add to the completeness of proof that the change from brown to white is for protection,--in the case of the weasel, both to enable it to escape from the fox and to circumvent the rabbit,--the weasels in Florida, where snow is unknown, do not change colour, but remain brown throughout the whole year.
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February holes are most interesting places and one never knows what will be found in the next one investigated. It is a good plan, in one's walks in the early fall, to make a mental map of all the auspicious looking trees and holes, and then go the rounds of these in winter--as a hunter follows his line of traps. An old, neglected orchard may seem perfectly barren of life; insects dead, leaves fallen, and sap frozen; but the warm hearts of these venerable trees may shelter much beside the larvæ of boring beetles, and we may reap a winter harvest of which the farmer knows nothing.
Poke a stick into a knothole and stir up the leaves at the bottom of the cavity, and then look in. Two great yellow eyes may greet you, glaring intermittently, and sharp clicks may assail your ears. Reach in with your gloved hand and bring the screech owl out. He will blink in the sunshine, ruffling up his feathers until he is twice his real size. The light partly blinds him, but toss him into the air and he will fly without difficulty and select with ease a secluded perch. The instant he alights a wonderful transformation comes over him. He stiffens, draws himself as high as possible, and compresses his feathers until he seems naught but the slender, broken stump of some bough,--ragged topped (thanks to his "horns"), gray and lichened. It is little short of a miracle how this spluttering, saucer-eyed, feathered cat can melt away into woody fibre before our very eyes.
We quickly understand why in the daytime the little owl is so anxious to hide his form from public view. Although he can see well enough to fly and to perch, yet the bright sunlight on the snow is too dazzling to permit of swift and sure action. All the birds of the winter woods seem to know this and instantly take advantage of it. Sparrows, chickadees, and woodpeckers go nearly wild with excitement when they discover the little owl, hovering about him and occasionally making darts almost in his very face. We can well believe that as the sun sets, after an afternoon of such excitement, they flee in terror, selecting for that night's perch the densest tangle of sweetbrier to be found.