Crocodile a-hemoglobin shares only 5.6% similarity with vipers (also reptiles) but 17.5% similarity with chickens. 1 This is awkward for evolutionists to explain, since they often say that similarity is evidence for common descent. In this case, the similarity cannot be explained by common descent, since chickens cannot possibly be closer related to crocodiles than vipers.
Convergence: A Problem for Evolution
When evolutionists try to draw their "tree" of related animals, they have a problem: not everything "fits." They must say that some things---even things that are extremely similar---evolved multiple times independently (called convergence). They say that eyes evolved 40-60 times independently. This is awkward for evolutionists to explain, but it makes much more sense for a creationist: God reuses good designs!
Sarfati, J. D., & Matthews, M. (1999). Refuting Evolution. Green Forest, AR: Master Books.
- Sarfati, 1999, p. 83 ↩