Critical edition based on a collation of the 26 known extant manuscripts and a study of the early Latin translations. Begun by Balme in 1975, with his work towards the Loeb editio minor of books VII–X, this edition includes all ten books, including a very full apparatus criticus. Volume I of the edition contains the complete text of the Historia Animalium, the critical apparatus, and Balme's introduction to the manuscripts, expanded and updated with the assistance of Friederike Berger, and in consultation with the editors of forthcoming editions of the extant medieval translations.