Jamieson, Fausset and Brown on Jeremiah 27:6

6. beasts of the field--not merely the horses to carry his Chaldean soldiers, and oxen to draw his provisions [Grotius]; not merely the deserts, mountains, and woods, the haunts of wild beasts, implying his unlimited extent of empire [Estius]; but the beasts themselves by a mysterious instinct of nature. A reproof to men that they did not recognize God's will, which the very beasts acknowledged (compare Is 1:3). As the beasts are to submit to Christ, the Restorer of the dominion over nature, lost by the first Adam (compare Ge 1:28; 2:19, 20; Psa 8:6-8), so they were appointed to submit to Nebuchadnezzar, the representative of the world power and prefigurer of Antichrist; this universal power was suffered to be held by him to show the unfitness of any to wield it "until He come whose right it is" (Eze 21:27).