We report an observation of interspecific nest sharing between Red-breasted Nuthatches (Sitta canadensis) and Mountain Chickadees (Poecile gambeli) near Williams Lake, British Columbia, Canada. The nest contained two Red-breasted Nuthatch and three Mountain Chickadee nestlings. The nest was attended by a pair of Mountain Chickadees earlier in the observation period and later by an adult female Red-breasted Nuthatch; all five nestlings fledged. Competition for nest sites due to a decrease in cavity availability may have contributed to this occurrence.
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