Channel Craft Audubon Twitter Bird Call Bundled with The Art of Pishing Book and CD Audubon bird caller is handcrafted and tuned to produce a variety of bird calls Bird call whistle is made from pewter and Birchwood and measures 2.5 x 0.75 inches Book with Audio CD, The Art of Pishing, by Pete Dunne teaches readers how to make a variety of sounds that attract birds The companion CD provides audio demonstrations to aid in learning This twitter bird call set is useful for beginners and seasoned bird watchers alike