The 'go to' scripture is:
Revelation 19:17, 18
I saw also an angel standing in the sun, and he cried out with a loud voice and said to all the birds that fly in midheaven: “Come here, be gathered together to the great evening meal of God, so that you may eat the flesh of kings and the flesh of military commanders and the flesh of strong men and the flesh of horses and of those seated on them, and the flesh of all, of freemen as well as of slaves and of small ones and great.”
But is that possible?....
That problem was expanded on by the WT in - you guessed it - the 1984 book Survival Into A New Earth as well as the 1 June 1973 Watchtower....
Survival Into A New Earth, page 31, paragraph 31
The Kind of Life That Awaits Survivors
True, as a result of the great destruction, the earth will be strewed with those slain by Jehovah. But no one knows better than God what needs to be done to safeguard the health of the survivors. He tells us that he will invite the birds of heaven and the beasts of the field to his “great evening meal” and that they will have their fill from the fleshy parts of those slain. (Revelation 19:17, 18; Ezekiel 39:17-20) What they do not consume he can dispose of by other means. God’s purpose for the earth as stated in Eden will then move forward to its fulfillment.
Watchtower 1 June 1973, page 346, bottom of first column
A Cleansed Earth
The prophecy of Revelation also describes the destruction of Satan’s earthly forces, giving the invitation to the birds to come to “the great evening meal of God.” (Rev. 19:17) On a previous occasion an avowed enemy of God was devoured by dogs, leaving only a few bones to bury. (2 Ki. 9:30-37) But the animals could never dispose of all those slain at Har–Magedon. Hence, the Almighty God will doubtless use some highly scientific means at his disposal to get rid of the surplus of the decaying bodies in a speedy and sanitary way. We remember that Noah and his seven fellow survivors of the global deluge were not burdened with burying the human victims of that world catastrophe after they came out of the ark and renewed Jehovah’s worship on earth. — Gen. 8:18-22.
Should we recoil in horror at the thought of such mass destruction? If a person is disposed to feel that way, he should ask himself, Did I express this reaction toward World Wars I and II, or did I actively or tacitly support these gory wars, which were not fought for Jehovah’s vindication, and did not result in a cleansed earth wherein righteousness dwells? The thing we must keep in mind is that Jehovah, by this fight, brings the earth back fully under his universal sovereignty and removes wickedness so that it can never again govern humankind. Those destroyed are haters of God.
