Sir John Richardson, in his "Zoology of North America," tells us "that this species advances east of the Rocky Mountains, as high as the sixty-eighth parallel. It arrives in the fur countries in April or May, and, having reared its young, retires southward early in October. It is by no means an uncommon bird in the districts through which he travelled, but, being very shy, only one specimen was procured. A pair were seen building their nests with sticks on a lofty tree, standing on a low, moist, alluvial point of land. They sailed round the spot in a wide circle, occasionally settling on the top of a tree, but were too wary to allow an approach within gun shot." In the softness and fulness of its plumage, its feathered legs, and habits, this bird bears some resemblance to an Owl. It flies slowly, sits for a long time on the bough of a tree, watching for mice, frogs, &c., and is often seen skimming over swampy pieces of ground, and hunting for its prey by the subdued daylight which illuminates even the midnight hours in high latitudes. Wilson observes that in Pennsylvania it is in the habit of coursing over the meadows long after the sun has set. It is fitted for this nocturnal chase by the fleeciness of its feathers, which contributes to render its flight noiseless." THE COMMON BUZZARD. The COMMON or MOUSE BUZZARD (_Buteo vulgaris_) is distinguished by its small, narrow, hooked beak, and bare tarsi; its tail is comparatively short, and its plumage less lax than that of the above-mentioned species, which, in other respects, it closely resembles. Its length is from twenty-two to twenty-five inches, its breadth from fifty to fifty-eight inches; the tail measures about nine inches. The coloration of the plumage varies so much in different individuals as to render a general description almost impossible--indeed, no two birds are alike.