In the Hebrew language, the same word is used for both 'whale' and 'dragon,' and both have a similar spiritual significance, as in Jeremiah 51:34.

(Референце: Apocalypse Explained 714)

In Revelation 19:11, this signifies revelation from the Lord respecting the internal sense of the Word, which is seen only by people whose spiritual minds are opened; i.e., people who love the Lord and have genuine faith in Him. (Arcana Coelestia 2760[2])