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Given that ear morphology is substantially affected both by phylogeny and body size, it is interesting to consider whether the relatively small anatomical differences expected in related species of similar size have a noticeable impact on hearing. We present a detailed anatomical description of the middle and inner ears of the red fox<jats:italic>Vulpes vulpes<\/jats:italic>, a widespread, wild carnivore for which a behavioural audiogram is available. We compare fox ears to those of the well\u2010studied and similarly sized domestic dog and cat, taking data for dogs and cats from the literature as well as providing new measurements of basilar membrane (BM) length and hair cell numbers and densities in these animals. Our results show that the middle ear of the red fox is very similar to that of dogs. The most obvious difference from that of the cat is the lack of a fully formed bony septum in the bulla tympanica of the fox. The cochlear structures of the fox, however, are very like those of the cat, whereas dogs have a broader BM in the basal cochlea. We further report that the mass of the middle ear ossicles and the bulla volume increase with age in foxes. Overall, the ear structures of foxes, dogs and cats are anatomically very similar, and their behavioural audiograms overlap. However, the results of several published models and correlations that use middle and inner ear measurements to predict aspects of hearing were not always found to match well with audiogram data, especially when it came to the sharper tuning in the fox audiogram. This highlights that, although there is evidently a broad correspondence between structure and function, it is not always possible to draw direct links when considering more subtle differences between related species.<\/jats:p>","DOI":"10.1111\/joa.13159","type":"journal-article","created":{"date-parts":[[2020,2,18]],"date-time":"2020-02-18T10:35:10Z","timestamp":1582022110000},"page":"980-995","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Functional anatomy of the middle and inner ears of the red fox, in comparison to domestic dogs and cats"],"prefix":"10.1111","volume":"236","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1099-0119","authenticated-orcid":false,"given":"Erich Pascal","family":"Malkemper","sequence":"first","affiliation":[{"name":"Department of General Zoology Faculty of Biology University of Duisburg\u2010Essen Essen Germany"},{"name":"Department of Game Management and Wildlife Biology Faculty of Forestry and Wood Sciences Czech University of Life Sciences Praha Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7845-0720","authenticated-orcid":false,"given":"Matthew J.","family":"Mason","sequence":"additional","affiliation":[{"name":"Department of Physiology Development and Neuroscience University of Cambridge Cambridge UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2618-818X","authenticated-orcid":false,"given":"Hynek","family":"Burda","sequence":"additional","affiliation":[{"name":"Department of General Zoology Faculty of Biology University of Duisburg\u2010Essen Essen Germany"},{"name":"Department of Game Management and Wildlife Biology Faculty of Forestry and Wood Sciences Czech University of Life Sciences Praha Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,2,18]]},"reference":[{"key":"e_1_2_8_2_1","unstructured":"1984 Johann Wolfgang Goethe\u2010Universit\u00e4t Frankfurt am Main Germany L. 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