Yuma Myotis - Myotis yumanensis
Similar in appearance to the little brown myotis (Myotis lucifugus), and can be difficult to distinguish.
Easily confused with little brown myotis.
Western Hemisphere Range
The species' distribution in the state is uncertain due to the difficulties in differentiating it from the Little Brown Myotis (Myotis lucifugus). Acoustic surveys in northwestern Montana and museum vouchers identified with skull measurements indicate the species is present west of the Continental Divide, but genetic confirmation is needed.
Summary of Observations Submitted for Montana
Number of Observations:
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Map Help and Descriptions
(Observations spanning multiple months or years are excluded from time charts)
Found near water in dry coniferous forests and arid shrublands. Summer day roosts include buildings, bridges, mines, and bat houses, sometimes caves and trees. Hibernacula not described.
Often prey on beetles as well as a variety of soft-bodied insects including flies, mosquitoes, mayflies, moths, and termites.
Emerge when it is nearly dark, often foraging low over water. Sexes segregated; males roost singly or in small groups. Maternity colonies can include several hundred individuals. Females have one young, usually born in late June or July. April records in Montana could be spring migrants.
This bat has only one young per year, and nothing is known about the mating and social system or natal sex ratio of this species. Mating is expected to be non-selective as in the Little Brown Myotis (Milligan 1993).
- Literature Cited AboveLegend: View Online Publication
- Milligan, B.N., and R.M. Brigham, 1993. Sex ratio variation in the yuma bat (Myotis yumanensis). Canadian Journal of Zoology 71:937-940.
- Additional ReferencesLegend: View Online Publication
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