The Mexican Chickadee (Poecile sclateri eidos) is a small, gray bird (13 cm [5 in] long; 11 g [0.4 oz]) with a black bib, black top of the head, and white face. It gleans small insects from foliage in wooded highlands of southeastern Arizona, southwestern New Mexico, and parts of Mexico. The Mexican Chickadee will experience a high degree of climate exposure and has a moderately high adaptive capacity. Overall, it has a Climate Change Vulnerability Index ranking of Less Vulnerable under both Representative Concentration Pathway (RCP) 4.5 and RCP 8.5 Scenarios. The Mexican Chickadee’s climate change vulnerability is impacted by factors related to movement, life history, and evolutionary potential, which influence its ability to shift in space, persist in place, and respond to climate change impacts.