θῦλαξ
From LSJ
ὑπὸ δὲ τῆς φιλαυτίας παρηγμένοι ἄλογα φασὶν τὰ ζῷα ἐφεξῆς τὰ ἄλλα σύμπαντα → it is self-love which leads them to say that all the other animals without exception are non-rational
English (LSJ)
ᾰκος, ὁ,= θύλακος, Arcesil.Com.1 D., Aesop.15;= προσκεφάλαιον, Hsch.; cited fr. Hom. by Poll.10.172; cj. in Sor.1.57.
German (Pape)
[Seite 1222] ακος, ὁ, oft v. l. für θύλακος.
Greek (Liddell-Scott)
θῦλαξ: -ᾰκος, ὁ, = θύλακος, Αἴσωπ. 28. 4: - θῡλάς, άδος, ἡ, Ἀνθ. Π. 7. 413.