Does vegetation or cover type affect sightability?
In flat terrain with low vegetation, detection rates can be over 90% in swaths unmatched by human vision. In the eastern and mid-western deciduous forest animals can be detected after leaf drop in the fall. Large mammals have been detected through dense tamarisk and other single layer shrub or tree canopies. Dense, multi-layer canopies can completely prevent detection. Animals can be detected even against dark backgrounds. Snow is not required.