The "hornsâ€ of the pronghorn are comprised of a slender, laterally-flattened blade of bone which grows from the frontal bones of the skull, forming a permanent core. Skin covers the bony cores and develops into a keratinous sheath which is shed and regrown on an annual basis. The horn sheaths of the pronghorn are branched, [...]
Read more about Pronghorn - New Mexico (2008) by screek
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Audubon Butterflies App
Field Guide to North American Butterflies.