And God said, Let the earth bring forth the living creature after his kind, cattle, and creeping thing, and beast of the earth after his kind: and it was so. And God made the beast of the earth after his kind, and cattle after their kind, and every thing that creepeth upon the earth after his kind: and God saw that it was good.
On the sixth day, God created animals and reptiles. The law of reproduction was repeated, they were to produce after their own kind. There are significant variations within “kinds” of biological life but there was no passing from one kind to another. Kinds only produce after their own kind.