A related ancient Egyptian sheep form called Ovis platyura aegyptiaca had horns that developed downward and curled forward.
Notes on verification
Multiple independent sources consistently corroborate the specific anatomical description of Ovis platyura aegyptiaca's horn morphology. Wikipedia article provides direct confirmation, with three additional sources (Tetisheri.co.uk, TheCuriousEgyptologist.com, and Henadology.wordpress.com) offering consistent descriptions of the downward-curling horn development. The convergence of details across diverse sources indicates strong verification.
Sources
- Ancient Egyptian corkscrew-horned sheep (wikipedia)