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Montana Animal Field Guide

Montana Field Guides

Yuma Myotis - Myotis yumanensis

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Potential Species of Concern

Global Rank: G5
State Rank: S3S4

Agency Status
FWP Conservation Tier: 2

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General Description
Similar appearance to, and difficult to distinguish from, Little Brown Myotis.

General Distribution
Montana Range

Western Hemisphere Range


Distribution Comments
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: 24

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Relative Density



(Records associated with a range of dates 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.

Food Habits
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.

Reproductive Characteristics
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).

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Citation for data on this website:
Yuma Myotis — Myotis yumanensis.  Montana Field Guide.  Montana Natural Heritage Program and Montana Fish, Wildlife and Parks.  Retrieved on April 20, 2014, from
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