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  • Home
  • News
  • Featured Books
    • All Featured Books
    • Book of the Month Series
    • BHL at 20
  • User Stories
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    • Fossil Stories
    • Garden Stories
    • Monsters Are Real
    • Page Frights
    • Her Natural History
    • Earth Optimism 2020
  • Tech Blog
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Biodiversity Heritage Library - Program news and collection highlights from BHL
Blog Reel, Featured Books

Say What?!

a variety of mammal ears

Sometimes I come across items in the BHL collection that elicit an immediate response. In this case it was, “Look at all those ears!”

Ears indeed. In 1912 Johan Erik Vesti Boas published his Ohrknorpel und äusseres ohr der Säugetiere; eine vergleichend-anatomische Untersuchung (Ear cartilage and outer ear of mammals, a comparative anatomical study). Beautifully illustrated, Boas’ book takes us through a host of mammal ears from rodents, to whales, kangaroos, pigs, bats, primates, and yes, even humans. There are some very nice cartilage spreads as well which we have included in our in our Flickr photostream but for now I will show some of my favorite pinnae (outer ear) pin-ups!

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Find the ear of the tiny tenrec here!
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Ooh, there’s a pika ear in here!
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Can you spot the capybara ear?

I cannot help but throw in a picture of a full color mammal pinna from my very own Canis lupus familiaris. If you look closely you can see the aperture, or the entrance of the ear canal, under all that hair.

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The study of the mammalian ear is important to evolutionary biology in that is an exemplar of the concept of exaptation which describes how traits from one organismal group are co-opted to function differently in another group. In this case, the jawbones of reptiles were co-opted to form the ear bones of mammals commonly known as the hammer, anvil and stirrup. [1]
Next time you are enjoying the company of fellow mammals, human or otherwise, take a closer look at their ears and think of yourself as Dr. Boas (with a cabinet full of ear specimens!) carefully examining and comparing one of the more functional pairs of our anatomies: the ears.
References
[1] Jaws to ears in the ancestors of mammals
February 21, 2013by [email protected]

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The Biodiversity Heritage Library (BHL) is the world’s largest open access digital library for biodiversity literature and archives. BHL operates as a worldwide consortium of natural history, botanical, research, and national libraries working together to digitize the natural history literature held in their collections and make it freely available for open access as part of a global “biodiversity community.”

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