18"wide by 18" tall
While chasing down a Moose in the campgrounds outside of Jackson Hole, WY, we happened to spot one far off along the river. So did many others with cameras so it became a traffic jam. We pulled over on the opposite side of the action and got our gear ready. When we looked back out we could not see him anywhere. Just as I said, "where is that darn Moose now?", he appeared just outside my driver's side window.