Ichthyology
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Ichthyology is the branch of zoology devoted to the study of fish, including bony fish (Osteichthyes), cartilaginous fish (Chondrichthyes), and jawless fish (Agnatha). According to FishBase, 33,400 species of fish had been described as of October 2016, with approximately 250 new species described each year.
Fish represent approximately 8% of all figurative depictions on Mimbres pottery.
Frontispiece from Ichthyologia, sive Opera Omnia de Piscibus by Peter Artedi
Image: Male whale shark at Georgia Aquarium
Image: Paedocypris progenetica 001
Zoology
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Zoology is the scientific study of animals. Its studies include the structure, embryology, classification, habits, and distribution of all animals, both living and extinct, and how they interact with their ecosystems. Zoology is one of the primary branches of biology. The term is derived from Ancient Greek ζῷον, zōion ('animal'), and λόγος, logos.
Conrad Gessner (1516–1565). His Historiae animalium is considered the beginning of modern zoology.
Animal anatomical engraving from Handbuch der Anatomie der Tiere für Künstler.
Kelp gull chicks peck at red spot on mother's beak to stimulate the regurgitating reflex.