Kelpie
Some call them demonic, the species is able to shift into two forms. One of the forms is that of a normal horse, the other is a twisted version of the first - one that is permanently dripping in water and able to stay submerged in water for up to twenty hours without surfacing. They have fangs, and will eat even other equines if hungry enough - They are strictly carnivorous. Their eyes in this second form appear glowing and without a pupil.