It has been suggested that Lasiurus cinereus cinereus migrates from summer roosts at higher latitudes to the coastal regions and southern latitudes in the United States and Mexico to overwinter, where little is known about its winter ecology. We found a hoary bat in a shrub in a conifer forest at high elevation in central Mexico in November 2019. We installed a camera trap and recorded it was hibernating for at least 12.7 days. Our record is by far the most southern hibernation location of tree bats in North America and it shows L. cinereus is capable of hibernating in a non-typical roost. We also open the possibility that camera traps may provide an additional, practical, and easy-to-use tool to study bat hibernation. Our finding expands the ultimate questions of why and where hoary bats decide to hibernate, migrate or both.

中文翻译：

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具有挑战性的白头蝠冬眠极限：灰灰灰狼鼠在北美冬眠的最南端记录

有人提出，灰灰灰灰狼从高纬度的夏季栖息地迁徙到美国和墨西哥的沿海地区和南纬地区越冬，在那里对其冬季生态知之甚少。2019 年 11 月，我们在墨西哥中部高海拔的针叶林灌木丛中发现了一只白头蝠。我们安装了一个摄像头并记录了它至少冬眠了 12.7 天。我们的记录是迄今为止北美树蝙蝠最南端的冬眠地点，它表明灰背蜂能够在非典型栖息地冬眠。我们还开启了相机陷阱可能提供额外、实用且易于使用的工具来研究蝙蝠冬眠的可能性。我们的发现扩展了苍白蝙蝠为何以及在何处决定冬眠、迁徙或两者兼而有之的终极问题。