amino acid
cervical esophagus
red-wattled
lapwing
pin-tailed sandgrouse
periodic acid–
Schiff
high-performance liquid
chromatograph
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The avian esophagus shows structural and functional differences related to feeding habits
and habitat, with mucous secretions and amino acids playing key roles in protection and
metabolism. The present study aimed to comparatively investigate the histological,
histochemical, and amino acid profile characteristics of the cervical esophagus in the
Iraqi pin-tailed sandgrouse (Pterocles alchata) and the red-wattled lapwing (Vanellus
indicus). A total of eight adult individuals from each bird species (sandgrouse and
lapwing) were collected from the Al-Samawah Desert, Al-Muthanna Province, and AlYusufiyah District, Baghdad Governorate, Iraq, respectively, between October 2025 and
January 2026. Histological examination was performed using hematox
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