Abstract
Two mixed pairs of towhees were found in irrigated desert yards near Tucson, Arizona. The first known towhee F1 hybrids, from a female Pipilo aberti (Abert's Towhee) and male P. fuscus (Canyon Towhee) were studied from winter of 1998–1999 through summer 2000. This mixed pair raised at least eight young in three broods during the two breeding seasons. Young were so similar to P. fuscus that, if seen outside this context, they would probably not be identified as hybrids. A second mixed pair, also near Tucson, suggests that hybridization between P. aberti and P. fuscus may be more common than originally thought. Lack of previously reported hybridization between P. aberti and P. fuscus may be either due to internal or external isolating mechanisms, limited survival and longevity, or human failure to recognize hybrids.
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