Revelation 19:17

Then I saw an angel standing on the sun. He cried in a loud voice to all the birds that fly in mid-heaven-- 'Gather and come to the great feast of God,

Revelation 19:21

The rest were killed by the sword which came out of the mouth of him who rode upon the horse; and all the birds fed upon their flesh.

Revelation 8:13

And, in my vision, I heard an eagle flying in mid-heaven and crying in a loud voice--'Woe, woe, woe for all who live on the earth, at the other trumpet-blasts of the three angels who have yet to blow.'

Revelation 14:6

Then I saw another angel, flying in mid-heaven. He had the Good News, decreed from eternity, to announce to those who dwell on the earth--to men of every nation, and tribe, and language, and people;

Treasury of Scripture Knowledge

Summary

And I saw an angel standing in the sun; and he cried with a loud voice, saying to all the fowls that fly in the midst of heaven, Come and gather yourselves together unto the supper of the great God;

Bible References

An angel

Revelation 8:13
And, in my vision, I heard an eagle flying in mid-heaven and crying in a loud voice--'Woe, woe, woe for all who live on the earth, at the other trumpet-blasts of the three angels who have yet to blow.'
Revelation 14:6
Then I saw another angel, flying in mid-heaven. He had the Good News, decreed from eternity, to announce to those who dwell on the earth--to men of every nation, and tribe, and language, and people;

Saying

Revelation 19:21
The rest were killed by the sword which came out of the mouth of him who rode upon the horse; and all the birds fed upon their flesh.