Abstract
The aim of this study to investigate the morphological and histological characteristics of the adrenal gland in the Eagle-owl (Bubo ascalaphus). Adrenal glands from seven specimens were collected, located dorsomedial near the kidneys. Morphologically, the gland was oval-shaped. It was a capsulated gland. Morphometric measurements showed similarities between the right and left glands; there was no noticeable difference between them in terms of weight, length, and width, and the proportionality was directly proportional to the bird's weight and size. Histologically, after performing the histological section and staining it with routine staining, we observed the three layers that make up the cortex (The zona Glomerulosa, zona fasciculata, and zona reticulares). The three layers with no obvious tissue distinctions between these; we also performed histological measurements using the Imaging program to determine the thickness of each of the capsule, cortex, and medulla in the gland, and used the arithmetic mean to determine the final value. The result was that the cortex is one and a half times the size of the medulla due to its multiple layers and secretion.