DD8 and I have gone to several park birding classes. We have feed the chickadees by hand. They also have taxadermy birds at the classes. It is such a wonderful experience.
Just a couple of ideas for you that I've seen... Bird clocks at each hour make the corresponding bird chirp. There are some books that have bird chirp buttons.
http://enature.com/fieldguides/intermediate.asp?curGroupID=1This site has a great reference for nature including the birds.
Check out the frogs too. You will be amazed how some of them sound.
Here's a magazine. It's for adults but the pictures alone are worth it.
Happy Birding
