. The bird; its form and function . Fig. 233.—Effect of environment on Bob-white, shown by specimens from Min-nesota, Florida, and Cnba. (From aphotograph provided by the AmericanMuseum of Natural History.) 294 The Bird climate, the birds, and in fact all of the animals, are ofa much lighter hue than those living in an atmosphereof great humidity, where moisture does not readily evapo-. FiG. 234.—Male Scarlet Tanagers, showing moult from the scarlet summer dress,(a), through the parti—coloured garb (b), into the green winter plumage (c). rate. In such a place birds tend to be very dark-coloure
. The bird; its form and function . Fig. 233.—Effect of environment on Bob-white, shown by specimens from Min-nesota, Florida, and Cnba. (From aphotograph provided by the AmericanMuseum of Natural History.) 294 The Bird climate, the birds, and in fact all of the animals, are ofa much lighter hue than those living in an atmosphereof great humidity, where moisture does not readily evapo-. FiG. 234.—Male Scarlet Tanagers, showing moult from the scarlet summer dress,(a), through the parti—coloured garb (b), into the green winter plumage (c). rate. In such a place birds tend to be very the case of captive birds, I have seen White-throatedSparrows and Wood Thrushes become almost like black- The Body of a Bird 295 birds in colour when confined in a bird-house where the airwas constantly moist. Correlated with the effect uponcolour is often a difference in size, and in many instancesamong birds the more northerly individuals are larger,those inhabiting warmer regions being less in stature. Among wild birds, the Quail, or Bob-white, shows analmost unbroken series from the northern, light-colouredvariety, ten inches in length, to the Cuban bird, very
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbirds, bookyear1906
