Elliott Coues,
Citizen Bird: Scenes from Bird-Life in Plain English for Beginners
“ They are true seed-eating birds, and their beaks are short, stout, and thick—cone-shaped it is called, like that of the White-throated Sparrow you learned about one day. This enables them to crack the various seeds upon which they live at all times except in the nesting season, when few seeds are ripe. During this time they eat a variety of insects, and feed them to the young birds; for young birds must grow so rapidly, in order to be strong enough for the autumn journey, that they require more nourishing food than seeds. ”
