Among the Birds in Northern Shires. Charles Dixon
gray, vermiculated with black. By the end of August this autumn dress is fully attained. It is worn for nearly a couple of months, subject of course to some change from abrasion and sun. Then comes the transition to the white winter plumage, which in most cases becomes complete by the middle of November contemporaneously with the snow that lies upon the mountains for the next three months or more. This beautiful arrangement of nature becomes even more impressive by certain comparisons. For instance, the Red Grouse, living as it does amongst the ling and heath, and in a region where snow seldom covers the ground for many days at a time, retains a brown dress throughout the year; in this species also the flight feathers are constantly brown in hue, just as those of the Ptarmigan are white. But the nearest ally of the Red Grouse, the Willow Grouse (the Lagopus albus of ornithologists), inhabiting the tundras of the arctic regions right round the world, assumes a pure white plumage for the winter (readily distinguished, by the way, from the Ptarmigan by the absence of the black patch before the eye), and in this case again the flight feathers are constantly white – a dress that is admirably protective amidst the winter snows of its northern home. Here, then, we have two birds distantly related, like the Ptarmigan and the Willow Grouse, donning white plumage in winter for protection, whilst the Red Grouse, so closely allied to the Willow Grouse, and resembling it in many details of its economy, remains practically the same in appearance summer and winter alike. The retention of the white quills is a very interesting fact. These Grouse moult their flight feathers but once in the year, in autumn; and probably the reason they are constantly white is because this tint is no disadvantage to the species, being always concealed except during flight. As we know, these birds take wing most reluctantly, always endeavouring to elude observation by crouching close to the ground. Similarly, the central tail-feathers of the Willow Grouse and Ptarmigan are the only ones that change in colour with the seasons – varying from white in winter to brown marked with gray and buff in summer, and gray mottled with black in autumn – the remainder being constantly black, and when the tail is closed of course concealed by the central pair.
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