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Stable isotope analysis has been widely used to investigate dietary and geographical information of organisms, but few studies have applied it to archaeological avian remains. Through carbon and nitrogen stable isotope analyses of bone collagen, this study examines the diet sources of several wild bird species in an attempt to discover their foraging patterns and associated human hunting behavior. These avian remains are from CA- ALA-554 in the East San Francisco Bay Area and represent a time span of 900 years, partly overlapping with the Medieval Climatic Anomaly (MCA). We compare the isotopic signatures of samples from different windows of time represented at the site to investigate the influence of droughts during the MCA and the responses of birds and humans. Our findings show that during the MCA, geese had a larger variance in δ13C and δ15N and avian fauna included a greater range of species. This suggests that birds might have migrated farther and widened their diets and ancient humans might have expanded their hunting range and diversified their prey, possibly in response to more challenging environmental conditions.