. The Journal of comparative neurology and psychology. igeons do not reach their maximum breeding powers until an ageof about three years. The lengih of life is not definitely known. EXPLANATION OF PLATE. Fig. 1.—The alarm (page 35). Both are in the attitude of alarm; buttlie more extreme in attitude is the adult bird, distinguished by the blackhalf-ring on the uecli. Fig. 2.—The charge (page 42). Male. Fig. 3. The perch coo (page 47). The bird that is cooing is an adult other bird is a young one. Fig. 4. —The nest-call (page 51). The bird with its head down in the nestis a male, nest
. The Journal of comparative neurology and psychology. igeons do not reach their maximum breeding powers until an ageof about three years. The lengih of life is not definitely known. EXPLANATION OF PLATE. Fig. 1.—The alarm (page 35). Both are in the attitude of alarm; buttlie more extreme in attitude is the adult bird, distinguished by the blackhalf-ring on the uecli. Fig. 2.—The charge (page 42). Male. Fig. 3. The perch coo (page 47). The bird that is cooing is an adult other bird is a young one. Fig. 4. —The nest-call (page 51). The bird with its head down in the nestis a male, nest-calling to the other bird, which is a female. Figs. 5 and 6.—The bowing-coo (l^age 48). Fig. 5 and Fig. 6 both showthe same bird (an adult male) in a phase of the bowing-coo. Fig. 5 showingthe up phase, and Fig. G the down phase. The bird is bowing-and-cooing tohis own image in a large mirror which was placed close against the end ofthe cage for the purpose of getting these photographs. i:\Il!KSSI<)NS OF KMOTION IN PIGEONS. WALLACE CRAU;..
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