'Speckled' in the Bible

I saw by night, and behold a man riding upon a red horse, and he stood among the myrtle trees that were in the bottom; and behind him were there red horses, speckled, and white.

Attached to the third chariot were white horses. Attached to the fourth chariot were speckled horses and gray horses.

The black horses are headed into the north country, and the white ones are headed out after them. The speckled horses are headed toward the south country."