A Type D personality is distressed, Type D's have a negative outlook towards life and are pessimistic. A small event that is not even noticed by type B can ruin type D's day. Type D personalities are more subject to depression than other personality types.
For most of human history, horses were seen as prey to be hunted for sustenance. During the late Pleistocene, around 55,000 years ago, Neanderthals scavenged off of horse carcasses and made occasional kills of their own.
New! The Horses of the Plains. Most of the evolutionary development of the horse (54 million years ago to about 10,000 years ago) actually took place in North America, where they developed the very successful strategy of grazing (eating grass) rather than browsing (eating softer succulent leaves).