COVER PHOTOGRAPH: Ventral view of the left wing of the Natal long-fingered bat, Miniopterus natalensis, with the progression of ossification during development from CS 19 (below) to CS21 (above). During these stages the digits begin to extend forming the highly elongated fingers of the unique bat wing. Cartilage was stained with Alcian blue and bone was stained with Alizarin red, figures are not to scale. See Hockman et al., Developmental Dynamics 238:965–979. Developmental Dynamics, 2009. © 2009 Wiley-Liss, Inc.