An angel invited all flesh-eating birds to feast on the flesh of people who would be killed by the Rider on the white horse. When the beast and the false prophet gathered kings with their armies to fight against the Rider and his army, the beast and the false prophet were thrown into the lake of fire. The Rider killed rebellious people with his sword, and the birds gorged themselves on their flesh.

Revelation 19:17-21

17 I saw an angel who was standing in the light of [MTY] the sun. He called loudly to all the flesh-eating birds flying high in the sky, “Come and gather for the wonderful feast that God is providing for you! 18 Come and eat the flesh of all God’s enemies who are dead— the flesh of kings, army commanders, people who fought powerfully, horses and the soldiers who rode them, and the flesh of all other kinds of people, whether they were free or slaves, socially insignificant or significant. All kinds!” 19 Then I saw the beast and the kings of earth with their armies gathered together to fight against the Rider on the horse, and against his army. 20 The beast and the false prophet were captured {He captured the beast and the false prophet}. The false prophet is the one who had performed miracles in the beast’s presence. By doing that he had deceived the people who had accepted the beast’s mark on their foreheads and who worshipped its image. The beast and the false prophet were thrown {He threw the beast and the one who falsely said that he spoke messages that came directly from God} alive into the lake of fire that burns with sulfur. 21 The rider on the horse killed the rest of their armies just by speaking words, which were like [MTY] a sword that extended from his mouth. All those birds gorged themselves on the flesh of the people whom he had killed.