• 1 · Religion and Magic
• 2 · Nature
• 3 · Human Being, Man in General
• 4 · Society, Civilization, Culture
• 5 · Abstract Ideas and Concepts
• 6 · History
• 7 · Bible
• 8 · Literature
• 9 · Classical Mythology and Ancient History

• Top
• 2 · Nature
• 25 · earth, world as celestial body
• 25F · animals
• 25FF · fabulous animals (sometimes wrongly called 'grotesques'); 'Mostri' (Ripa)
• 25FF4 · fabulous animals ~ reptiles
• 25FF42 · fabulous animals ~ snakes (aspic, dragon, hydrus, hydra, amphisbaena, horned snake, cerastes)
• 25FF423 · 'hydrus' (watersnake)

25FF4231 · 'hydra'; 'Hidra' (Ripa)

• 25FF4231(+0) · 'hydra'; 'Hidra' (Ripa) (+ variant)