From the Cornell Lab of Ornithology, All About Backyard Birds Flash Cards adds several twists to the flashcard genre, including streaming birdsong audio (using our free downloadble Bird QR app), female plumage, and beloved content from the Lab’s own allaboutbirds.org, used by 14 million bird lovers each year. This flash pack consists of birds from all over regional Western North America with 100 cards in each set, plus 10 bonus birdsong guessing cards.