. Vogelleben: Ein Leitfaden für das Studium unserer gemeinsamen Vögel . Lassiert, nach der mannerin wliich sie diese Artikel verwenden, als Weber, Schneider, Maurer, Mehlmaschinen, Zimmerleute, Filter, etc. Manchmal beide Geschlechter bei der Konstruktion der am stärksten unterstützen, oder ein Vogel sammelt das Material, während der andere es anpasst. Auch hier führt das Weibchen die Aufgabe allein aus, unterstützt nur durch die ermutigende Stimme des Männchens. Die Bauzeit variiert von einem bis zu zwei Wochen bis zu drei Monaten im Falle der südamerikanischen 0enl)ird, die im Juni beginnt zu bauen, die es erst im Oktober besetzen wird. T

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. Bird-life: a guide to the study of our common birds . lassified, according to the mannerin wliich they employ these articles, as weavers, tailors, masons, molders, carpenters, felters, etc. Sometimes both sexes assist in the construction of thenest, or one bird collects the material while the otheradjusts it. Again, the female performs the task alone, aided only by the encouraging voice of the male. The time of construction varies from one to twoweeks to as long as three months in tlife case of the SouthAmerican 0enl)ird, who in June begins to build thenest it will not occupy until October. The Fish Hawkevidently believes in the value of a stick in time, andoften repairs its nest in the fall. Lack of space prohiliits a discussion of the influenceswhich assist in determining: the character of birds nests.They may be summarized as follows : /T/A-f, necessity for protection. Sen III <J^ conditions imposed by locality. These affectboth the site and material, as illustrated by Doves, whonest in trees in wooded countries and on the ground in. Plate XXII. Page 112. YELLOW-BILLED CUCKOO.Length, 12-25 inches. Upper parts glossy olive-brown; outer tail-feathers blacli, tipped with white; under parts white; lower mandibleyellow. BIRDS NESTS. 67 treeless regions, and by birds who substitute strings, cotton, or rags for their usual nesting materials. Third, condition of the young at birth, whetherfeathered or naked. The young of what are termed■ prsecocial birds are hatched with a covering ofdowny feathers. Gulls, Ducks, Snipe, Chickens, Par-tridges, and Quails are familiar members of this group.Their young can run about soon after birth, and a well-formed nest is not needed. But the Joung of altricialbirds are hatched practically naked and are reared in thenest, which is therefore not only a receptacle for the eggsduring incubation, but a home. Thrushes, Sparrows, infact all Perching Birds, Woodpeckers, Hummingbirds, and many others belong in this group of altricial birds.

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