My sister-in-law's sister works at the local high school and told me they had some books for teachers to buy and if I wanted to get some. She mentioned a book with bird songs and I knew it had to be one of these. I got it at half the original price too. I was jumping for joy when I finally got it. It is neat. The boys love it. Now I have to save up for the others. I'd love to get the other one of 250 bird songs from North America Birds and the one from Around the World will be the last one I get.