الفهرس 
INTRODUCTION AND AIM OF THE WORKOnly 14 pages are availabe for public view
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Abstract
Feeding habitats and behavior are linked to a variety of environmental factors and hippocampus anatomical features, as well as protein expression levels that may improve their cognitive memory capacities. Methods: The current study investigated the cytoarchitecture infrastructure, the variation in the hippocampal volume, and the expressional distribution of the proteoglycan agrin and ryanodine receptor protein; in the brain hippocampal complex of three bird species (the hooded crow (Corvus cornix, food caching), the cattle egret (Bubulcus ibis, non-food caching), and the rock dove (Columba livia, food caching), also the difference in myelination in the axons of medulla oblongata were investigated using transmission electron microscopy techniques. Results: The histological results clarified that the anatomical brain structure and cytoarchitecture did not show specific characterization features only for the hooded crow with large-sized soma. Immunohistochemical techniques of hippocampal complex for agrin proteoglycans and ryanodine receptor calcium channels proteins showed significant increase among the hippocampus of Corvus cornix brain at the area of the medial hippocampus (HCm) Abstract and lateral hippocampus (HCl) with values P < 0.001, respectively. The highly expressed agrin could play a major role in elevating the neuronal plasticity and reactivity of neurons. Moreover, there were significant difference in the studied hippocampal volume, but neuronal count did not appear with for the caching and non-caching behavior, also the intensity of axon myelination in the Corvus cornix suggests better signaling.