Because God created them to do so. 21 And God created the great sea creatures* and all living creatures* that move and swarm in the waters according to their kinds and every winged flying creature according to its kind. And God saw that it was good. 22 With that God blessed them, saying: "Be fruitful and become many and fill the waters of the sea,+ and let the flying creatures become many in the earth." Genesis 1:31 31 After that God saw everything he had made, and look! it was very good.+ And there was evening and there was morning, a sixth day.
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