Donkeys signify things relating to the intelligence of the sensual man; and camels, the things of intelligence in the natural man. (Isaiah 30:6, 7)

In Genesis 12:16, donkeys signify earthly knowledge. (Arcana Coelestia 1486)

In 1 Samuel 9:3, donkeys signify the Lord's preparation for His natural life on Earth. (Arcana Coelestia 2781[5])

In Luke 19:28, 41, a donkey and the foal of an donkey signify the natural man as to good and truth.

(Reference: Apocalypse Explained 654)