"Bird" is a symbol of a person who is in an emotional, elevated state of spiritual flight of his soul and spirit by cognition and fulfillment of Heavenly, spiritually elevated Laws, Commandments of God. 

"Birds" also symbolize reasoning, rational, intellectual, intellectual, spiritual beginnings, abilities of man.

Negative meaning.

"Bird" is a symbol of a person who rises above others by his sinful wisdom, philosophies, false beliefs, philosophies.

"Birds of the sky" is an image of the various cruel political and wicked religious leaders of the world who dwell in the clouds of their ideologies and dogmas.