Seal Brown (Seal Bay) Seal brown is a very dark variation of bay, sometimes appearing almost black at first glance. This colour is also sometimes called seal bay. Both names refer to the same coat.
Chestnut (Red) Together with black and bay, chestnut is one of the three base colours a horse can have. You may know this colour as red or sorrel as well.
Bay Bay is one of the three base coat colours in horses, together with chestnut and black. It is usually grouped in these three types: wild bay, bay, and seal brown.