Proghorn Buck 6218 - Copyright MacNeil Lyons Images
Image Title:
Spring Buck, Yellowstone Nat'l Park, WY

Photographer's Notes:
    This pronghorn buck has made it through
    another winter season at the 5,200' winter
    range near Gardiner, Montana.
    This is the only horned North American
    mammal that sheds it's "sheath" each year!  
    Adult males grow a hard sheath made out of
    compacted hairs. The growth starts at the top
    of the dermal bone and works it's way down
    to the base.
    Pronghorn can run at 30 mph for 15 miles,
    with spurts up to 70 mph - making it the
    fastest land mammal in N. America!

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