Herpetological Conservation and Biology 14(1):1–30. Submitted: 31 March 2018; Accepted: 11 March 2019; Published 30 April 2019. FEEDING ECOLOGY OF A GENERALIST PREDATOR, THE CALIFORNIA KINGSNAKE (LAMPROPELTIS CALIFORNIAE): WHY RARE PREY MATTER 1,2,7 3 4 5,6 KEVIN D. WISEMAN , HARRY W. GREENE , MICHELLE S. KOO , AND DOUGLAS J. LONG 1Garcia and Associates, 2601 Mission Street, Suite 600, San Francisco, California 94110, USA 2Department of Herpetology, California Academy of Sciences, 55 Music Concourse Drive, Golden Gate Park, San Francisco, California 94118, USA 3Museum of Vertebrates and Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York 14853, USA 4Museum of Vertebrate Zoology, University of California at Berkeley, Berkeley, California 94720, USA 5Riverside Metropolitan Museum, 3580 Mission Inn Avenue, Riverside, California 92501, USA 6Department of Vertebrate Zoology and Anthropology, California Academy of Sciences, 55 Music Concourse Drive, Golden Gate Park, San Francisco, California 94118, USA 7Corresponding author, e-mail:
[email protected] Abstract.—We studied the feeding ecology of California Kingsnakes (Lampropeltis californiae) based on stomach contents of 2,662 museum specimens, 90 published records, and 92 unpublished observations. These snakes typically are diurnal, wide-foraging generalists and ingest prey head-first. Twenty-nine percent of 447 diet items were mammals, 29% were snakes, 25% were lizards, 11% were birds, 4% were squamate eggs, 1% were unidentified squamates, and 1% were amphibians. We detected no differences in diet based on kingsnake sex or color pattern, nor evidence of individual specialization. Rodents, lizards, and birds were eaten more frequently by larger individuals; snakes were eaten with similar frequency independent of predator size.