The spleen structurally and functionally belongs to the hematopoietic organs and is also an important component of the reticuloendothelial system, which is known to play a major role in host defense. The histological structure of the spleen was investigated in the ostrich, a non-flying bird, the kestrel, a raptor, and the osprey, a fish-eating bird of prey (fish eagle). For this purpose, Mallory’s modified triple stain, methyl green-pyronin and silver stain were used. Germinal centers were not present in the spleen of the osprey. In the spleen of the kestrel, penicillar arterioles and the surrounding lymphoid tissue were markedly dense. Compared to the other two birds, the red and white pulps were clearly distinguishable in the spleen of the ostrich.
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Kozlu, T., Sari, E.K., Bozkurt, Y.A. et al. A Comparative Study on the Histological Structure of the Spleen in the Ostrich (Struthio Camelus), the Kestrel (Falco Tinnunculus) and the Osprey (Pandion Haliaetus). BIOLOGIA FUTURA 62, 113–121 (2011). https://doi.org/10.1556/ABiol.62.2011.2.1