. . . . . . . . . "Larus delawarensis" . . "Chroicocephalus philadelphia" . . "Paul Tavares. 2017. Larus delawarensis other species in group Chroicocephalus philadelphia. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/8797443> 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." .