Is the Shark Related to the Pig?

January 16, 2026

Category: Animals, Evolution

Speaker: Ian Taylor

Tags: worldview, devotional, creation science, christian radio, biochemistry, creation moments, ian taylor, biblical proof, today’s creation moment

If all life evolved from, and is related to, earlier forms of life, then closely related animals should also have similar kinds of chemicals in their bodies. As the science of biochemistry has grown, those who believe in evolution have held high hopes that creatures that look similar to each other would also have similar chemicals. For example, insulin from a shark should be more like insulin from other fish than insulin from mammals.

Unfortunately for the evolutionist, chemical comparisons between various creatures don't usually show the same relationships as their evolutionary charts. For example, research at the Medical University of South Carolina compared the hormone relaxin that was produced by pigs and rats with relaxin produced by sharks. The results showed that the pig's relaxin was more like the shark's relaxin than it was like a rat's.

This seems to suggest that pigs are more closely related to sharks than to another mammal, the rat. A similar study comparing insulin showed a closer similarity between the shark and the pig than between the shark and another fish, the carp.

While evolutionists will sometimes point out instances where these comparisons have worked out as they expected, those results are unusual. Normally these comparisons show that the evolutionary histories and relationships that evolutionists claim are nothing more than imagination. As the Bible says, each kind of creature gives evidence to the fact that it was uniquely created by God.

Genesis 1:21
"So God created great sea creatures and every living thing that moves, with which the waters abounded, according to there kind, and every winged bird according to its kind. And God saw that it was good."

Prayer: Dear heavenly Father; I thank You that You have provided each living thing, including myself, with the unique bodily needs so necessary for life. I ask that the fact that each kind of creature has been specially created by You would become increasingly apparent to modern science. In Jesus' Name. Amen.

Print this transcript