Great shots, I can never get anywhere near that close to the Elk around here, they tend to be very easy to spook. I have a driveway alarm, sometimes it will go off in the middle of the night and I will always go see what it is. If it is deer they just freeze, but if it is Elk they take off running the second I open the door - they sound like a bunch of horses galloping away.
Here is a photo I took of part of the herd (there are over 300 in this herd) I took about 1/2 mile up the road:
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