Because of the mountain of Zion, which is desolate, the foxes walk upon it.
All Commentaries on Lamentations 5:18 Go To Lamentations 5
Thomas Aquinas
AD 1274
Here is indeed cause for sadness: "For Mount Zion which lies desolate; jackals prowl over it." That is, where the temple is. And: "jackals prowl over it." As if they were residing in remote desert places. Thus, the prophet Micah reports: "Therefore because of you Zion shall be plowed as a field; Jerusalem shall become a heap of ruins, and the mountain of the house a wooded height." (Micah: 3:12).