Looks like a muley tail. What leads one to surmise it's a cross?

Color variations do occur. The pic below is a yearling muley for sure and a product of a twin birthing. Nearest blacktails are about 150 miles away. Not the typical mule deer tail though.
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Same buck the year before as a fawn with his sister, who was melanistic.
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Their mom was a typically patterned muley and is to the far left below.
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Can't make any claims as to who their father/s might have been although Cookie caught up with this guy about 25 miles away.
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This fellow from a prior year was also a little strange. Had a black stripe from nose all the way down his back to the tip of his tail, but was muley all the way.
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Cookie found him across 4 seasons but his existence is now uncertain.

Despite antler configuration, the below is also a solid mule deer trailing a doe through our back yard.
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Takes a serious examination to definitively determine heritage. We do have some whitetails in northeast and western Oregon and a few along the Columbia River.

Once listened to a Geist presentation on deer evolution. As to gait when fleeing from danger, tongue in cheek he said mulie/whitetail crosses were totaly confused and just stood around.

We see both species fenced in on Montana's Bison Range, but haven't noted any obvious cross overs.

Last edited by 1minute; 08/12/22.

1Minute