February 1870 Issue [Article] Beast, bird, and fish. Fourth paper Download PDF Adjust Share Birds of the air by Burt G. (Burt Green) Wilder, This article is only available as a PDF to subscribers. Download PDF Tags 19th century Birds Birds, Fossil Evolution (Biology) Flying squirrels Locomotion Morphology United States More from Burt G. (Burt Green) Wilder Editor’s drawer Beast, bird, and fish. Third paper Beasts of the earth Beast, bird, and fish. Second paper Fish of the sea Adjust Share