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In page California leaf-nosed bat:

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The bats are susceptible to human disturbance, which can be especially detrimental to the species during summer months, when rearing their young. Human disturbance of caves in which they roost is a major threat. Furthermore, because they often roost in abandoned mines, reclamation practices and re-working old mines can severely impact populations. Because California leaf-nosed bats do not hibernate or migrate, the relatively warm mine shafts are critical for their survival in the northern portions of its range.[1]