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Size compaarison, a western mastiff bat (Eumops perotis), North America's largest, versus a canyon bat (Parastrellus hesperus), the smallest.

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Size compaarison, a western mastiff bat (Eumops perotis), North America's largest, versus a canyon bat (Parastrellus hesperus), the smallest.

000 1108 1988 Big Bend Ranch Molossidae North America Texas U.S.diagnostics favorites box 000 western mastiff bat Eumops perotis western pipistrelle or canyon bat Parastrellus hesperus