In Zechariah 9:9, the King comes to Jerusalem riding on what?

Answer: A donkey's colt

"See, your King comes to you, righteous and victorious, humble and riding on a donkey, on a colt." Matthew 21:5 cites this.

“Rejoice greatly, O Daughter of Zion! Shout in triumph, O Daughter of Jerusalem! See, your King comes to you, righteous and victorious, humble and riding on a donkey, on a colt, the foal of a donkey.”— Zechariah 9:9 (BSB)