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The present work aims to investigate the morphometrical, histological, and histochemical, aspects of the esophagus and stomach in two different Egyptian birds having different food habits. The animals under investigation are Kingfisher (Halcyon smyrnensis), and Hoopoe (Upupa epops). These birds were caught from Abou-Rawash Constituency and Nile Delta in Egypt. The birds were dissected; after which the esophagus and stomach were fixed and stained for the comparative histological study. From the current results, it was revealed that, there are some morphometric differences between kingfisher and hoopoe in both esophagus and stomach. The esophagus wall in Kingfisher composed of only three layers or tunics: mucosa, muscularis and adventitia arranged from the inside to outside, referring to the absence of tunica submucosa;whereas, the esophagus of the Hoopoe consists of four distinct functional layers; mucosa, submucosa, muscularis and the outermost serosa. Stomach in the two studied birds is divided into two parts, glandular or true stomach (proventriculus) and the muscular stomach or gizzard (ventriculus). The glandular stomach showed moderate differences in length and width between kingfisher and hoopoe.The mucosa of proventriculus in the kingfisher consists of number of large compound folds which appear as finger-shaped structures with gastric pits; mucous cells are most conspicuously distinguished by their "empty" appearance. While, the mucosa of proventriculus in the hoopoe have both parietal cells and chief cells which occur in the middle portion of gastric glands. The gizzard wall has a thick keratinized layer called koilin, the secretion of the gizzard glands forms the koilin in hoopoe but in kingfisher the gizzard wall is small and very thin keratinoid lining.

Histological and histochemical studies of the esophagus and stomach in two types of birds with different feeding behaviors