After this I beheld, and see another, like a leopard, which had on the back of it four wings of a fowl; the beast had also four heads…
The empire which rose on the ruins of the second monarchy was the Grecian. Alexander the Great subverted the Persian empire. The leopard is remarkable for its swiftness, and for the eagerness with which it springs upon its prey; and we know, also, how rapid were the conquests of Alexander, how eager he was to subdue all nations. This rapidity is symbolized in the vision by the four wings which the leopard had on its back. The leopard with four wings reigned over the vanquished bear. The leopard also prefigured the downfall of the Grecian kingdom. The leopard was seen with four wings upon its back; but besides these wings, it is described as having four heads, and these four heads symbolized its downfall. When Alexander died, his kingdom was divided among his captains, four of them.
(W. Wood, A.M.)
Parallel VersesKJV: After this I beheld, and lo another, like a leopard, which had upon the back of it four wings of a fowl; the beast had also four heads; and dominion was given to it.