What most of us already know, but it's nice to see confirming research being done and published:
I have said for years that Keil Bay understands almost everything I say to him. He's absolutely a verbal learner and responds far more quickly to words than to cues, especially the natural horsemanship cues, which he thinks are primitive and beneath him.
Nice article, but would someone please tell me what the heck is in the mouth of the horse in the photo? Not a very nice thing to do to a good friend, imo. :/