how can i get the birds out of the walls?
Answers:
Let them finish roosting and then when they leave close off the vents and secure the place where they are getting in.
Other answers:
Exterminators do the job.
Exterminators do the job.
buy cats and put them in the walls
Lauer them out maybe.. somehow?
Install nettings and covered over these holes will keep the birds away. It is a simple and cheap solution.
Lite weigh grates of screening do the job and bring no harm to your house or the birds. netting or screening can be purchased in a Home Depot or Lowe's or even your local hardware store.
Enjoy your Summer Tweet, Tweet..