How do you get birds that are living in your house to leave?

So apparently a bird decided to go down our chimney and made a nest in the walls of my family's house. For the past few weeks we've been hearing the birds chirping non-stop, but we're not sure how we're going to get them out without causing a big ruckus. We're kind of hoping that they'll just leave, but so far there's no luck. Any advice?

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Batman · 41-45, M

Go to the store get a bottle of N2 or (nitrogen). Find where you think they are and spray the N2 into the wall. It will displace the oxygen and kill them. The only reason you want to use N2 is because it’s not flammable. That will be $500 bucks please lol jk