We live in an apartment and don't have a yard, but we still love to see wildlife out our window. (Having a golf course right next door helps with seeing birds and other animals, but we still wanted to invite more!)
To invite more birds we decided to make a bird feeder out of a large yogurt container. I just cut two large holes on the sides of the yogurt container.
Then we filled it up with birdseed and put the lid on. Here are the kids inspecting the new bird feeder: