If you’re wanting to help your kids learn more about birds this spring, you should definitely consider adding The Backyard Birdsong Guide [amazon.com link] by Donald Kroodsma to your home library. We have the edition covering birds of western America, but there are also eastern and comprehensive North American versions available as well.
Along with information on different bird species, the book has an attached audio player that plays the songs and calls of each bird. The western North American version covers 75 different species and has around 130 songs/calls.
Everyone in the family loves this book, and Spud loves pulling it out on a rainy day when we can’t get outside to hear the real birds.