My standardbred gelding (and a lot of other standies on the farm) change colour according to seasons; some more than others. Choco in particular appears a light, faded bay one part of the year; then will change to a darker brown and at other times will appear pitch-black. His mane and tail always stay black, as do his legs. His muzzle will lighten to a 'tan' colour and darken again throughout his colour change as well. I have always thought of him as a dark bay, although I have heard recently that he may be brown. What is he really?