Heres a reference to the unclean spirit which passes out of the land
Zech 13:2 And it shall come to pass in that day, saith the LORD of hosts, that I will cut off the names of the idols out of the land, and they shall no more be remembered: and also I will cause the prophets and the unclean spirit to pass out of the land.
If an unclean spirit goes out of a man (likened to a wicked generation) He speaks of seven more wicked then itself entering back in, which is sorta kool because theres eight here
2Cr 10:20 For I fear, lest, when I come, I shall not find you such as I would, and that I shall be found unto you such as ye would not: lest there be debates, envyings, wraths, strifes, backbitings, whisperings, swellings, tumults:
Which could ressemble a cage full of hateful birds.
Sorta ressembles this in a way too (by way of a dwelling place, cage, or habitation)
Rev 18:2And he cried mightily with a strong voice, saying, Babylon the great is fallen, is fallen, and is become ***the habitation*** of devils, and the hold of every foul spirit, and a cage of every unclean and hateful bird.
The cup of the Lord is blessing
1Cr 10:21 Ye cannot drink the cup of the Lord, and the cup of devils: ye cannot be partakers of the Lord's table, and of the table of devils.
Jerm 5:27 As a cage is full of birds, so are their houses full of deceit: therefore they are become great, and waxen rich.
Birds and deceit, but speaks of "laying up" deceit within oneself
Prov 26:24 He that hateth dissembleth with his lips, and layeth up deceit within him;
Prov 18:20 A man's belly shall be satisfied with the fruit of his mouth; and with the increase of his lips shall he be filled.
Heres two examples of being "filled"
Rom 1:29 Being filled with all unrighteousness, fornication, wickedness, covetousness, maliciousness; full of envy, murder, debate, deceit, malignity; whisperers,
And/Or
Phil 1:11 Being filled with the fruits of righteousness, which are by Jesus Christ, unto the glory and praise of God.
But I cant say for sure beasts, I pretty much just compare verses . Cant say either way myself.
God bless you