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Proceedings of the Zoological Society of London, London, Academic Press periodicals, zoology, The illustration showcases various stages of avian coccidiosis, a parasitic disease affecting birds. Detailed drawings depict multiple oocyst forms, including immature and mature stages, as well as sporulated and unsporulated variants. Each specimen is labeled with numerical references, facilitating identification and study. The arrangement highlights the complexity of the life cycle and morphology of the coccidia, contributing to a deeper understanding of this significant avian pathogen. (Photo by: Sepia Times/Universal Images Group via Getty Images)