We investigated the occurrence of abbreviated pinnae (squared ears) in little brown bats (Myotis lucifugus) and northern bats (Myotis septentrionalis) in Michigan, USA. Although the trait was not observed in 308 M. septentrionalis, squared ears occurred in 56 (0.1%) of 5,863 M. lucifugus that were examined. Squared ears were equally common in males and females. Both ears typically were affected to the same degree and most often reduced by 50% of their height, although the amount of pinna that was missing varied from 5 to 50%. Previous authors speculated that the trait was an ontogenetic malformation, but microscopic examination of squared ears from M. lucifugus in Michigan indicated that the trait consistently was associated with trauma, most likely frostbite.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.