Originally posted by i-Jinx:

I have had bats and drakes show up inside my house during raids (it is a tall house). Did they actually spawn in there? Do flyers ignore the usual spawn suppression? I put a workbench up in the roof to see if it makes any difference. Anyone got info on this?

If you have so much as a 1x1 unfilled window space (or even just a functioning chimney that actually vents to the outside), they're going to get in during a raid.

Spawn suppression inside a base is less useful against raids than regular random spawns, since the raid critters spawn from the outer reaches of the raid zone. They'll also quickly get inside if there is an opportunity because they enter the world both aggroed and knowing where you are and will do their best (bar getting distracted by more visible/accessible secondary targets) to make their way there.