In evolutionary biology there are two related but different concepts. One is parallel evolution where two fairly closely related species develop similar adaptations independent of one another. The other concept is convergent evolution where two unrelated species develop similar adaptations independently. Examples of convergent evolution abound--the dorsal fins of sharks and dolphins are great examples of this concept.

http://thegreenbuildingadvisors.blogspot.com/

Also check out Michael's account of his visit at: http://bizcloud25.asoshared.com/~yestermo/sites/default/files/sites/default/files/images/blogspot/07/visiting-yestermorrow-design-build.html

Bob Ferris
Yestermorrow Design/Build School