Ying: Homologous Structures

Horns

Watusi Cattle (Bos taurus)
[42.063738,-71.586217]

Barbary Sheep (Ammotragus lervia)
[42.062993,-71.587237]

Hooves 

Fallow Deer (Dama dama)
[42.062591,-71.585752]

Warthog (Phacochoerus africanus)
[42.063319,-71.586945]