Rufous-winged Sparrow -Aimophila carpalis-
This small sparrow is found on flat, dry grasslands that are host to thorn-scrub habitats from southern Arizona to northwestern Mexico. An uncommon resident of local distribution in the Sonoran Desert, this species is shy and elusive and is difficult to see except when the male is singing from exposed perches. The Rufous-winged Sparrow may depend on rainfall as a stimulus for nesting. It typically nests after summer rains have begun, often building a nest and laying its first egg within 5 or 6 days after the first rain. Incubation lasts 11 days, and young fledge in only 8 or 9 days. In Arizona, in years of unusually heavy winter rainfall, pairs may also nest in spring. Territories are normally maintained throughout the year, and pairs remain mated for life.