And perhaps at that point the species were immutable. The Fall of Man, with our subsequent domination of the planet, possibly assured that the age of major evolutionary changes was over. After all, Adam did name the animals. I don't believe in a literal interpretation of the Bible, but everything in there is meant to tell us something, usually something impossible for people to comprehend at that time. Adam's naming of the animals is possibly meant to tell us that evolution--in terms of species' changing--was over at that point.
Unfortunately for your idea at least this particular point is that evolution is For a population to not evolve seven conditions need to be met.
1. mutation is not occurring
2. natural selection is not occurring
3. the population is infinitely large
4. all members of the population breed
5. all mating is totally random
6. everyone produces the same number of offspring
7. there is no migration in or out of the population
If any of these is not met, the population is evolving.