Carol Walker / Head portrait of wild dun roan Mustang mare in Sand Wash Basin, Colorado, USA.
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Carol Walker / Wild Mustang, dun horse in dust, Sand Wash Basin Herd Area, Colorado, USA.
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Carol Walker / Wild Mustang, dun horse resting, Sand Wash Basin Herd Area, Colorado, USA.
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Carol Walker / Wild Mustang, dun horse in dust. Sand Wash Basin Herd Area, Colorado, USA.
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Carol Walker / Mustang horse, dun mare and blue roan foal nuzzling. Sand Wash Basin Herd Management Area, Colorado, USA.
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Carol Walker / RF - Mustang horse, dun mare and blue roan foal nuzzling. Sand Wash Basin Herd Management Area, Colorado, USA. (This image may be licensed either as rights managed or royalty free.)
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John Shaw / Soaptree yucca (Yucca elata) on gypsum dun, White Sands National Monument, New Mexico, USA. December
