Proximate mechanisms are required to trigger the onset of a particular behaviour—such as sexual behaviour in rats (Rattus), the development of singing behaviour and song recognition in white-crowned sparrows (Zonotrichia leucophrys), the cessation of brood care and the onset of foraging behaviour in worker honeybees, and the development of bright plumage and sexual display in the superb fairy wren.
Examples breeding in North America are the chipping sparrow (Spizella passerina) and the tree sparrow (S. arborea), trim-looking little birds with reddish-brown caps; the savanna sparrow (Passerculus sandwichensis) and the vesper sparrow (Pooecetes gramineus), finely streaked birds of grassy fields; the song sparrow (Melospiza melodia) and the fox sparrow (Passerella iliaca), heavily streaked skulkers in woodlands; and the white-crowned sparrow (Zonotrichia leucophrys) and the white-throated sparrow (Z. albicollis), larger species with black-and-white crown stripes.
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Examples breeding in North America are the chipping sparrow Spizella passerina and the tree sparrow S arborea trim-looking little birds with reddish-brown caps the savanna sparrow Passerculus sandwichensis and the vesper sparrow Pooecetes gramineus finely streaked birds of grassy fields the song sparrow Melospiza melodia and the fox sparrow Passerella iliaca heavily streaked skulkers in woodlands and the white-crowned sparrow Zonotrichia leucophrys and the white-throated sparrow Z albicollis larger species with black-and-white crown stripes