This README is just to describe files in the Dryad upload for the warbler hybrid identification paper "Predictable outcomes of warbler hybridization: Synthesis and an exceptional Yellow× Black-throated Blue Warbler (Setophaga petechia× S. caerulescens) pairing". KMO_Photos.zip: A zipped directory of photos of the focal hybrid taken by Kristen M. Oliver. MJA_Photos.zip: A zipped directory of photos of the focal hybrid taken by Michael J. Andersen.