. . . . . . . . . "Sitta canadensis" . . "Abies balsamea" . . "Eric Knopf. 2016. Sitta canadensis birds nesting in Abies balsamea. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/3048575> 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." .