I'll follow that response up with the fact that they are more cautious looking where they are going than where they have come from, regardless of the wind, and many times they will have the wind at their back. The reason for that is that they can use their eyes for side and front vision while depending on their nose to detect danger coming from behind where they have already been. When a deer or elk lays down they normally lay with the wind coming over their back and watch downwind. In that way they are protected from danger coming from either direction.