Mj. Gill et Pg. Krannitz, A CASE OF HELPING-BEHAVIOR AT A BREWERS SPARROW, SPIZELLA-BREWERI, NEST, Canadian field-naturalist, 111(4), 1997, pp. 650-652
A single case of helping behavior was recorded in a breeding populatio
n of the sagebrush subspecies of Brewer's Sparrow in the Okanogan Vall
ey, Washington State. This is the first report of cooperative breeding
in the Brewer's Sparrow.