When the (other) kingdoms are symbolized, they are

And when He likens the kingdoms, He likens them only to cedars, as it is said (Ezekiel 31:3), "Behold, Assyria was a cedar in Lebanon, fair of branch," and it says (Amos 2:9), "Yet it was I who destroyed the Amorite before them, whose height was like the height of the cedars," and it says (Daniel 4:17), "The tree that you saw, which grew great and strong, whose height reached to heaven, and which was visible to the ends of all the earth." But when He likens the Egyptians, He likens them only to stubble. As it is said, "It consumes them like stubble" (Exodus 15:7). When He likens the kingdoms, He likens them only to silver and gold, as it is said (Daniel 2:32), "As for that statue, its head was of fine gold." But when He likens the Egyptians, He likens them only to lead, as it is said (Exodus 15:10), "They sank like lead." When He likens the kingdoms, He likens them only to wild beasts, as it is said (Daniel 7:3), "And four great beasts." But when He likens the Egyptians, He likens them only to foxes, as it is said (Song of Songs 2:15), "Catch us the foxes."