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" ... Predictably, predation plays an important role in driving the evolution of optimal fledging times for birds. Songbirds that experience higher daily rates of predation -- species like towhees and juncos that build open-cup nests on the ground or in low bushes -- have evolved younger ages of fledging to deal with this pressure. In contrast, this pressure to fledge early is relaxed for birds that enjoy a relatively low risk of nest predation -- as seen in cavity-nesting birds, like chickadees and bluebirds. ... "
" ... That scenario differs sharply from expectations for desert specialists -- Abert’s towhees, cactus wrens and curve-billed thrashers. These specialists have relatively small distributional ranges and, because their populations are confined mainly to hot deserts, they are more vulnerable to, say, the 4 C warming scenario that is predicted to occur by the end of this century. ... "