. . . . . . . . . "Sitta europaea" . . "Corylus colurna" . . "Thorsten Usee. 2017. Sitta europaea associated species with names lookup Corylus colurna. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/9332556> 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." .