Acknowledgements
We are grateful to the numerous members of Team Squirrel for contributing to data collection for this study. We thank the staff of the East Bay Regional Park District, especially to J. Miller and D. Bell, and to the California Department of Fish and Wildlife for their cooperation. This work was supported by a National Science Foundation Graduate Research Fellowship for Ortiz-Jimenez and a National Science Foundation ROA supplement (DEB 1456730) awarded to Sih and Smith. Ortiz-Jimenez was further supported by Cota-Robles Fellowship and Jastro Shields Award from UC Davis. Smith was supported by the Letts-Villard Endowed Professorship in the Natural Sciences from Mills College and the Undergraduate Education Program of the W. M. Keck Foundation. Pendleton and Smith were supported by the Barrett Foundation through the Jill Barrett Undergraduate Program in Biology at Mills College. Lastly, we thank Mary Bowerman Research fund from Save Mount Diablo for supporting Ortiz-Jimenez, Pendleton and Smith.