. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fig. 109.—a, Australian weaver-finch, Munia flaviprymna, a desert inhabitant; b, the same after three years' residence in a humid climate; c, Munia castanei- thorax, not a desert form. After Seth-Smith. to temperature than to humidity. The darkening of the red slug (Avion empiricorum) is said to parallel the humidity; in the same manner certain snails, Helix arbustorum and Succinea pfeifferi, are darker than usual in damp habitats.11 On the other hand, an abundance of moisture

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. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fig. 109.—a, Australian weaver-finch, Munia flaviprymna, a desert inhabitant; b, the same after three years' residence in a humid climate; c, Munia castanei- thorax, not a desert form. After Seth-Smith. to temperature than to humidity. The darkening of the red slug (Avion empiricorum) is said to parallel the humidity; in the same manner certain snails, Helix arbustorum and Succinea pfeifferi, are darker than usual in damp habitats.11 On the other hand, an abundance of moisture  Stock Photo
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. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fig. 109.—a, Australian weaver-finch, Munia flaviprymna, a desert inhabitant; b, the same after three years' residence in a humid climate; c, Munia castanei- thorax, not a desert form. After Seth-Smith. to temperature than to humidity. The darkening of the red slug (Avion empiricorum) is said to parallel the humidity; in the same manner certain snails, Helix arbustorum and Succinea pfeifferi, are darker than usual in damp habitats.11 On the other hand, an abundance of moisture
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. Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage . Fig. 109.—a, Australian weaver-finch, Munia flaviprymna, a desert inhabitant; b, the same after three years' residence in a humid climate; c, Munia castanei- thorax, not a desert form. After Seth-Smith. to temperature than to humidity. The darkening of the red slug (Avion empiricorum) is said to parallel the humidity; in the same manner certain snails, Helix arbustorum and Succinea pfeifferi, are darker than usual in damp habitats.11 On the other hand, an abundance of moisture seems to promote the existence of albinistic snails. The common frog (Rana temporaria) and the mountain lizards (Lacerta vivipara) are also said to be darker in a more humid environment. The song sparrow is paler in the arid parts of the United States, and more melanistic in the wet Puget Sound country, than it is in the mesic regions of the eastern states. This reaction is widespread among the mammals, without being, however, a universal phenomenon. Thus the water-inhabiting varieties of the field mouse, Microtus terrestris, the so-called water rat, are generally darker colored than the garden-

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