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Most animals face changes in the availability of food and the environmental conditions in the places where they live. In response, they need to adjust their behavioral, physiological, and morphological traits. In temperate zones and high latitudes, bats increase their body mass ( M    b   ) in autumn to store fat reserves and use them during hibernation. However, other small mammals decrease their  M    b    prior to winter to reduce the energetic requirements of individuals. These changes are unknown for bats inhabiting other highly energetic demanding environments. We measured changes in  M    b    of 84 non-reproductive males of  Eptesicus fuscus  inhabiting a tropical montane ecosystem in central Mexico over seasons. We also examined the relationship of bats’  M    b    with the minimum ambient temperature ( T    a   , °C) and mean precipitation (mm). Bats presented an increase in  M    b    from March to June, followed by a decrease from September to November and presented the lowest  M    b    from November to March, in the dry-cold season. The results suggest that the pattern of changes in  M    b    could be the result of two non-exclusive components related to the bats’ energy budget, the energetic demands experienced by the bats throughout the year and the morphological adaptations animals could display to reduce their energy requirements during the winter.

The big brown bat ( Eptesicus fuscus ) reduces its body mass during winter in a tropical montane ecosystem of central Mexico