Besides the structure of limbs and teeth, another argument for the descent of the horse has been drawn from certain phenomena of colouration.
"The Old Riddle and the Newest Answer"
John Gerard
Only those skilled in the ways of the wild fully realise how conspicuous amidst foliage, for instance, would be a uniform colouration.
"The Human Side of Animals"
Royal Dixon
In fact, it is quite probable that they give through this varying colouration the "life-history" of their family.
"The Human Side of Animals"
Royal Dixon