[Jenny]

...or

God created full grown creatures, see what the Bible says about the birds:

Genesis 1:20 Then God said, "Let the waters abound with an abundance of living creatures, and let birds fly above the earth . . ."

Genesis 1:22 And God blessed them, saying, "Be fruitful and multiply, and fill the waters in the seas, and let birds multiply on the earth."

So on the day God created the birds, he told them to fly! God made the birds first, then told them to have baby birds in the next verse.

The answer must be the chicken.