Allen’s Lappet-browed Bat

The Allen’s lappet-browed bat is named for the distinct pair of lappets, or lobes, on its forehead. It has long, soft fur and large ears for enhanced hearing. It has been found roosting in boulder piles, mines, and under exfoliating bark in trees.

  • Common Name:

    Allen's Lappet-browed Bat

  • Scientific Name:

    Idionycteris phyllotis

  • Weight:

    8 to 16 grams

  • Conservation Status:

    Not Evaluated

  • Size:

    Wingspan: 12-14 inches

  • Where to See:

    Central Mexico through the southwestern United States, including Arizona, New Mexico, Colorado, Utah, Nevada, and California


The Allen’s lappet-browed bat makes an audible loud “peep” at a frequency of about once per second when flying across open spaces. Limited information on food habits suggests that this bat feeds primarily on small moths, flying ants, and beetles. Females give birth to a single pup, usually born in June and able to fly by late July. Captured rarely during biological surveys, this beautiful bat is typically very docile.

Where they are Found

This bat is mostly found in oak-juniper and ponderosa pine forests from elevations between 1,100 and 2,500 meters. In Arizona, it has been observed roosting under loose bark, in lightning-caused cracks of large diameter Ponderosa pine snags, boulder piles, rock crevices and occasionally in abandoned mines. It is one of the rarest bats in North America and seldom observed.

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