And God said, “Let the waters swarm with swarms of living creatures, and let birds fly above the earth across the expanse of the heavens.” ²¹ So God created the great sea creatures and every living creature that moves, with which the waters swarm, according to their kinds, and every winged bird according to its kind.  And God saw that it was good. ²² And God blessed them, saying, “Be fruitful and multiply and fill the waters in the seas, and let birds multiply on the earth.” ²³ And there was evening and there was morning, the fifth day.

(Genesis 1:20-23 -- ESV)