Study
18 And to rule over the day and over the night, and to divide the light from the darkness: and God saw that it was good.
"Birds" represent rational concepts in the external man and intellectual concepts in the internal man.
2 "Speak to the children of Israel, and tell them, 'When anyone of you offers an offering to Yahweh, you shall offer your offering of the livestock, from the herd and from the flock.