What's That Squeaking?

This morning I was in the office checking my e-mail, and I heard this squeaking sound. I thought maybe there was a hurt animal outside, so I went to the side yard, nothing there. Came back in, thought maybe an animal was stuck in the dryer vent. I turned on the dryer with no heat, and the sound did not change. I listened some more, and it sounded like it was coming from inside the wall in the bathroom. I worried that maybe an animal was stuck in the wall somewhere, but then I realized that more than one animal was making the sound. I am guessing that some birds decided to make a nest inside the vent to the bathroom.

Not sure what to do in this situation, I googled 'birds in bathroom vent' and surprisingly this is a fairly common problem. There is mixed advise regarding what to do if this should happen to you, but it just seems to me that this problem could be avoided if people spent an extra $5 or $10 when building their homes, and just got the appropriate cover that keeps small animals and birds out in the first place. Anyway, the best and most humane advise I read so far is to just wait for them to leave, then clean out and cover the hole. One site said that once you can hear the babies they are about 6-10 days old (maybe older) which means they should be ready to leave in 11-15 days. In the meantime they will squeak every 20 minutues or so during the day when their parents come to feed them....jeesh, and I thought feeding Liam every 3-4 hours was rough! Anyway, we hope that they do leave on their own, and we can take care of the hole without too much trouble. Moral of the story- When building, it is wise to use venting guards that keep wildlife out! OR, check your home and fix any holes before they move in!