Acorn Naturalists offers an array of Audubon Birds, plush birds that accurately reproduce each species’ call as well as reflect their markings and colorations. These birds offer a perfect supplement for storytelling with young children as well as for teaching them about bird diversity. Song recordings are reproduced from field records collected by the Cornell Lab of Ornithology. Designed to provide hours of listening and learning fun for children ages 6-13. Audubon Birds average about five inches in height.