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| On the tragelaphus goat-stag, the chameleon, and the rest that change color | Ch. 33. |
| On the tarandus reindeer, the lycaon, and the thos a type of jackal | Ch. 34. |
| On the porcupine | Ch. 35. |
| On bears and their young | Ch. 36. |
| On Pontic and Alpine mice and hedgehogs | Ch. 37. |
| On the leontophonus a small animal said to kill lions, the lynx, bees, and squirrels | Ch. 38. |
| On the viper, snails, and lizards | Ch. 39. |
| On dogs | Ch. 40. |
| On the bite of a mad dog | Ch. 41. |
| On the nature of horses | Ch. 42. |
| On donkeys and mules | Ch. 43. |
| On oxen | Ch. 44. |
| On the apis the sacred Egyptian bull | Ch. 45. |
| On the nature of herds and livestock | Ch. 46. |
| On the kinds of wool and clothing | Ch. 47. |
| On the musmon mouflon | Ch. 48. |
| On goats and their generation | Ch. 49. |
| On swine and their nature | Ch. 50. |
| On parks for beasts | Ch. 51. |
| On semi-feral animals | Ch. 52. |
| On apes | Ch. 53. |
| On hares | Ch. 54. |
| On deer | Ch. 55. |
| On mice and dormice | Ch. 56. |
| Which animals are not in which places | Ch. 57. |
| Which animals are harmful to newcomers | Ch. 58. |
Total items, histories, and observations: 788.
Mutianus, Icilius, Verrius Flaccus, L. Piso, Cornelius Valerianus, Cato the Censor, Fenestella, Trogus, Actius, Columella, Virgil, Varro, L. Metellus, Scipio, Cornelius Celsus, Nigidius, Trebius Niger, Pomponius Mela, Manilius Sura.
King Juba, Polybius, Onesicritus, Isidorus, Antipater, Aristotle, Demetrius the physicist, Democritus, Theophrastus, Euanthes, Apocha (the Olympian victor), King Hiero, King Attalus, King Philometor, Ctesias, Duris, Philistus, Archytas, Phylarchus, Amphilochus, Athenaeus, Anaxipolis, Apollodorus of Thasos, Lenius, Aristophanes of Miletus, Antigonus, Cineus, Agathocles of Chios, Apollonius of Pergamon, Aristandrus of Athens, Bacaius of Miletus, Bion of Soli, Chaereas of Athens, Diodorus of Priene, Dion of Colophon, Epigenes, Evagon of Rhodes, Thasius, Euphronius, Athenaeus, Hegesias, Maroneus, Meuadrus of Paros, Menecrates the poet of Heraclea, Androtion (who wrote on agriculture), Escrio (who wrote on the same), Dionysius (who translated Mago), Diophanes (who made an epitome from Dionysius), King Archelaus, Nicander.
The histories and natures of aquatic animals.
| On the nature of aquatic animals | Ch. 1. |
| Which animals in the sea are the largest | Ch. 2. |
| On the beasts of the Indian sea | Ch. 3. |
| Which are also in the ocean | Ch. 4. |
| On the figures of tritons, Nereids, and sea-elephants | Ch. 5. |
| On whales and orcs a large sea predator, likely the orca | Ch. 6. |
| Whether fish breathe, whether they sleep | Ch. 7. |
| On dolphins and their wondrous nature | Ch. 8. |
| On porpoises | Ch. 9. |
| On tortoises and how they are caught | Ch. 10. |
| Who first began to cut tortoises | Ch. 11. |
| The coverings of aquatic animals | Ch. 12. |
| On the seal | Ch. 13. |
| On fish without hair, how they give birth, and how many of their kinds there are | Ch. 14. |
| On the names and natures of many fish | Ch. 15. |
| On omens and the diversity of fish | Ch. 16. |
| On the mullet and other fish, and those which are not prized everywhere | Ch. 17. |
| On the mule-fish, the coratinus, the salpa, and the salmon | Ch. 18. |
| On the exocoetus flying fish, mice, polypi octopuses, and moray eels | Ch. 19. |
| A digest of fish by body shape | Ch. 20. |
| On eels | Ch. 21. |
| On catching them in Lake Benacus | Ch. 22. |
| On the nature of the moray | Ch. 23. |
| On flatfish | Ch. 24. |
| On the sea urchin and its wondrous nature | Ch. 25. |
| On the variety of the nature of fish | Ch. 26. |
| On the kite-fish and the sea-dragon | Ch. 27. |
| On fish without blood | Ch. 28. |
| On squid, cuttlefish, polypi, and nautili | Ch. 29. |
| On the onigena a legendary or unidentified crustacean, lobsters, crabs, snails, and shellfish | Ch. 30. |
| On crabs | Ch. 31. |
| On snails | Ch. 32. |
| On scallops | Ch. 33. |
| On marine riches | Ch. 34. |
| How they are born, where, and how |