Have found that looking up will often give more info, tops of trees, cloud movement, pollen blowing etc.
When spying I try and see if there is any discernible wind movement near the animal or on the path to it.
Above is a well-filmed example of how deer (elk in this case) can spook from wind scent alone (around the 5min mark), if you watch further they go back to the same place and shoot it later. I think if they had been seen the first time it would have been a no-go!
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