. Lehrerhandbuch des Vogellebens: Ein Leitfaden für das Studium unserer gemeinsamen Vögel. Er Boden, von einem Barsch, in der Luft, etc.; Jahreszeit des Liedes). 8. Call-Notes (von Überraschung, Alarm, Protest, Warnung, Signalisierung, etc.). 9. Jahreszeit (Frühling, Herbst, Sommer, Winter, mit Zeiten von ar- rival und Abfahrt, und Variationen in Anzahl-bers). 10. Nahrung (Beeren, Insekten, Samen usw.; wie gesichert). 11. Paarung (Gewohnheiten während der Balz). 12. Nesting (Wahl des Standortes, Materials, Konstruktion, Eier, incu- Bation).10. Die Jungen (Nahrung und Pflege, Zeit im Nest, Notizen, Aktionsflug). Aus Beobachtungen dieser Art, bestehend o

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. Teachers' manual of bird-life : a guide to the study of our common birds . he ground, from a perch, inthe air, etc.; season of song). 8. Call-notes (of surprise, alarm, protest, warning, signaling, etc.). 9. Season (spring, fall, summer, winter, with times of ar- rival and departure, and variations in num-bers). 10. Food (berries, insects, seeds, etc.; how secured). 11. Mating (habits during courtship). 12. Nesting (choice of site, material, construction, eggs, incu- bation).10. The Young (food and care of, time in the nest, notes, actionsflight). From observations of this kind, consisting of a simplestatement of facts, you may philosophize •according toyour nature on the relation between habit and structure, colors and haunts, and intelligent adaptation to new con-ditions. Beware, however, lest you be led to draw faultyconclusions from insufficient observation. Do not makethe individual stand for its species, or the species for itsfamily, and remember that one is warranted in theorizingonlv when the facts in the case are facts indeed. TOPOGRAPHY OF A BIRD.. / it H 5 J^--^^^^ C3 :: ^ * g 0 ;3 _, 1 ^^ N CHAPTER YIILA FIELD KEY TO OUR COMMON LAND BIRDS. When you have seen a bird witli sufficient definite-ness to describe its color, form, and actions, reference tothe following key will often prove a short cut to itsidentity. This key is based only on adult males, who, because of their song, often brighter colors, and greateractivity, are far more frequently observed than thefemales. But, knowing the male, you ^vill rarely, duringthe nesting season, be at loss to recognize his mate. In order to simplify the key, the water birds, Hawks, and Owls are omitted, in the belief that they will bemore readily identified by reference to the plates. The use of the key may be illustrated by the follow-ing example: Let us imagine that you see a ChippingSparrow (Plate XLY) feeding about your doorstep.You note his size, chestnut cap bordered by white, blackbill, brownish, streaked ba

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