Dr. Turell, - I will have to dig for the Wallaby experiment. I think it was Eldridge, but it showed how in 50 years speciation and dramatic shift in phenotype happened in an isolated group of Rock Wallaby. I'm sure you're familiar with the definition of speciation but I'll print it for anyone who reads this: It is a difference drastic enough that the "child" group can no longer mate with the "parent" group. (Sorry, my biology terminolgy is REALLY rusty.) - So far: - http://www.suite101.com/discussion.cfm/atheism/95745/838506 - Just that of a creationist using the rock wallaby argument to claim a 6000 yr earth is viable. - http://www.bioone.org/doi/abs/10.1644/1545-1542%282002%29083%3C0437%3AMGAOTN%3E2.0.CO%3... - Here's a better one that discusses the full taxonomic difference. - What about rapid changes in phenotype arising from incestuous unions? That's how we got our varieties of dogs...