. . . . . . . . . "Larus delawarensis" . . "Larus occidentalis" . . "Valtierra. 2017. Larus delawarensis associated species with names lookup Larus occidentalis. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/9187841> on 05 Apr 2018." . . . . "http://iNaturalist.org is a place where you can record what you see in nature, meet other nature lovers, and learn about the natural world." .