Sorry if I'm a little late for this thread but I just joined. There is a fantastic collection in book form called "Animal Folk Songs for Children---Traditional American Songs" by Ruth Crawford Seeger. (Linnet Books, Shoestring Press, ISBN 0-208-02364-X) This collection was originally published in 1950 but was reprinted by Linnet in 1993. The great thing about this book is that tapes are also available. The tapes themselves are very good, with the songs treated as legitimate music rather than cutesy versions for kids.