One of the number one entry points for bats is through the eaves or soffits. Generally this is at the point of intersection where 2 roof lines come together. Often there are construction gaps because the roofers leave openings to lay the shingles under so no bare wood is showing. Well in reality they are suppose to be back flashed but 99% of the time they are not. Bat removal from eaves is done with an exclusion tube or bat netting. Bats will fly out but not be able to return.