What type of marks can be used to identify bat entryways?

Smooth, polished rub marks are indicative of bat activity as these marks occur when bats consistently enter and exit specific entry points. As bats navigate in and out of their roosts, their bodies rub against surfaces, such as the edges of doors, windows, or other structures, leading to a smoothening effect on these areas. This polishing effect is a clear indicator of regular use by bats, making it a reliable characteristic for identifying bat entryways.

The other types of marks listed do not accurately represent the typical signs of bat entry. Wet, yellow marks might suggest the presence of some other animals or could be related to moisture issues, while rough, jagged scratches could be attributed to a variety of wildlife or environmental factors. Firm, textured imprints usually relate to footprints or other types of animal tracks, which are not specific indicators of bat entryways.