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Our results revealed that the esophagus is displaced on both sides of the neck and has highly folded tunica mucosa, which confer greater elasticity for efficient swallowing and passage of food to the crop. The proventriculus is delicate and its mucosal layer contains polymorphic glands with dense profound and superficial secretory units that open to the luminal surface by gastric pores. The ventriculus is biconvex and lined with a keratinized koilin membrane. The tubular glands within the mucosal lining include the isthmus, the neck, and the basal segment that comprise chief and basal cells with prominent nuclei. At the cuticle\u2010mucosal interface, pyramidal vertical rodlets of the cuticle are secreted and superficially covered by a thin film of a horizontal matrix. The mucosa of the ileum form pyramidal villi that are oriented perpendicularly to the central lumen. Enterocytes infiltrated with goblet cells make up the epithelial lining of the villi. There are subtle differences in the thicknesses of corresponding tunics together with histochemical reactions of alcian blue (AB) and Masson\u2013Goldner trichrome (MT) for their microstructures. Overall, our findings reveal remarkable convergence of both macro\u2010and microstructures in <jats:italic>S. decaocto<\/jats:italic> to other granivorous species, and offer further evidence of the close association between functional morphology and feeding style relative to food swallowing, digestion, and absorption.<\/jats:p>","DOI":"10.1002\/jemt.23843","type":"journal-article","created":{"date-parts":[[2021,5,26]],"date-time":"2021-05-26T01:38:29Z","timestamp":1621993109000},"page":"2837-2856","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Macro\u2010 and microstructures of the digestive tract in the Eurasian collared dove, <i>Streptopelia decaocto<\/i> (Frivaldszky 1838): Adaptive interplay between structure and dietary niche"],"prefix":"10.1002","volume":"84","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4705-380X","authenticated-orcid":false,"given":"Ahmed A.","family":"El\u2010Mansi","sequence":"first","affiliation":[{"name":"Biology Department, Faculty of Science King Khalid University  Abha Saudi Arabia"},{"name":"Zoology Department, Faculty of Science Mansoura University  Mansoura Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eman A.","family":"El\u2010Bealy","sequence":"additional","affiliation":[{"name":"Biology Department, Faculty of Science King Khalid University  Abha Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ahmed M.","family":"Rady","sequence":"additional","affiliation":[{"name":"Biology Department, Faculty of Science King Saud University  Riyadh Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mohamed A.","family":"Abumandour","sequence":"additional","affiliation":[{"name":"Anatomy and Embryology Department, Faculty of Veterinary Medicine Alexandria University  Behera Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dina A.","family":"El\u2010Badry","sequence":"additional","affiliation":[{"name":"Zoology Department, Faculty of Science Mansoura University  Mansoura Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,5,25]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.21608\/idj.2019.64030"},{"issue":"2","key":"e_1_2_9_3_1","first-page":"4241","article-title":"Comparative histological study of stomach in domestic pigeon (Columba livia domestica) and domestic quail (Coturnix coturnix)","volume":"19","author":"Abdul\u2010Ridha A.","year":"2019","journal-title":"Biochemical and Cellular Archives"},{"issue":"4","key":"e_1_2_9_4_1","first-page":"80","article-title":"Histomophological studies on the stomach of Eurasian Hobby (Falconinae: Falco subbuteo, Linnaeus 1758) and its relation with its feeding habits","volume":"1","author":"Abumandour M. 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