A bird book or internet, bird feeder, birdseed, paper or a journal
Put bird seed in either a purchased or homemade bird feeder. For the youngest children, simply watching for birds at the feeder will be exciting. For Preschoolers and older, document your findings by taking pictures, writing the words or making a chart. If using a chart, you can tally the kinds of birds that are observed. Older children might research birds in books or on the internet at www.nbr.nbs.gov - Bird identification Center (you can even hear bird songs from this site). Make a bird journal with your pictures and results. Have your child note if he sees any differences in varieties of birds in different seasons.
The more excitement you show about the birds that are in your yard, the more interest your child will show.