I found this idea on a blog.
http://www.preschoolplaybook.com/2011/02/feeding-birds.html
It was actually a lot of fun and the boys really got into it....that and eating cheerios.
We went with the plain cheerios rather then fatten up the birds with honey nut cheerios!
Luke likes them anyway he can get them!
Then we tied them up in the trees for the birds to nibble on.
We watched for awhile, but no birds...
I think next time I will need to find a more visible tree to hang them in.