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Proceedings of the Zoological Society of London, London, Academic Press Periodicals, Zoology, The illustration presents a collection of detailed scientific drawings depicting various forms of Eimeria (Coccidium) avium, with an emphasis on their sporogony stages. Each numbered figure shows the morphological characteristics of the parasitic protozoa, highlighting the different developmental stages such as oocysts and sporozoites. The arrangement allows for easy comparison of size, shape, and internal structures, showcasing the complexity and diversity within this genus of parasites commonly found in avian hosts. This educational material serves as a reference for researchers and students studying parasitology and avian health. (Photo by: Sepia Times/Universal Images Group via Getty Images)