Genomic differentiation and local adaptation on a microgeographic scale in a resident songbird Honors Thesis Presented to the College of Agriculture and Life Sciences, Cornell University in Partial Fulfillment of the Requirements for the Biological Sciences Honors Program by Chloe Sofia Mikles May 2020 Advised by: Irby J. Lovette Director, Fuller Evolutionary Biology Program, Cornell Lab of Ornithology Jennifer Walsh Postdoctoral Fellow, Fuller Evolutionary Biology Program, Cornell Lab of Ornithology