This brief article aims to supplement Stefan Schnieders's presentation of the evidence for Historia animalium 7—that is, Book 7 according to the manuscript tradition, Book 8 according to Theodore Gaza's rearrangement—having been considered the seventh book of this work in antiquity. This is accomplished through the discussion of two texts not considered by Schnieders, both of them passages commenting on Iliad Book 21: P.Oxy. 221 and Porphyry, Homeric Questions Book 1.