Ladybug postscript

Just in case I have an entomologist reader who was interested and maybe even excited by my ladybug observations, I have decided to update that post. Four days ago it happened that I had not plucked any ladybugs from my four big south-facing windows. [Sometimes I just get bored with it. Other times I get too busy.] I was sitting in my chair three feet in front of the windows about noon, the sun was pouring in and the bugs were all crawling around as usual. I got very hot and cranked open the window on the east side about 3 inches. I later went about my business and forgot that I had opened the window. About sundown I became cold, remembered about the window and closed it. Only six ladybugs remained. Had the others--A. crawled out the window to the great outdoors? or B. felt a draft and crawled into the cracks around the windows? When they had not returned for two days, I favored explanation A. The third day was Easter and I was gone for the day. Today at least thirty, maybe forty bugs are back. [They're hard to count from the chair without plucking them because they move around so much.] Because they are back again I am now favoring explanation B., although they could have come back in from outside I suppose.