. Nature study and agriculture. Nature study; Agriculture. RuBY-CROWNED KiNGLET American Robin may be heard on its spring and fall migrations as well as in its nest- ing range. M. and S.R. Thrush Family. — This family is given first rank among birds, being noted for the gentle bearing of its members and the sweet and refined quality of their voices. They are of medium size, practically all of them being from seven to eight inches in length except the Robin, which is ten. The prevailing color of the upper parts is brown, though in some species this is re- placed with olive or slate and in the B
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