I looked up, and there before me was a ram with two horns, standing beside the canal, and the horns were long. One of the horns was longer than the other but grew up later. (NIV)
And I lifted up my eyes and saw, and behold, there stood before the river a [single] ram which had two horns [representing two kings of Medo-Persia: Darius the Mede, then Cyrus]; and the two horns were high, but one [Persia] was higher than the other, and the higher one came up last. (AMP)
Then I lifted up mine eyes, and saw, and, behold, there stood before the river a ram which had two horns: and the two horns were high; but one was higher than the other, and the higher came up last. (KJV)