Oh, you misunderstood me. I know evolution, believe me. The core concept of evolution is change (or if you like, natural selection). Pure, indifferent change. Whether it is based on behaviour, genetics, or technology (see the Singularity movement)-- change is the prime mover of all things based on evolution. Take the finches (Darwin's classic example) on the Galapagos islands: it is assumed that these birds evolved from one original specie, or progenitor specie. The birds settled on the different islands along the Galapagos group and were 'screened' from one another by a physical barrier (namely, a large body of water; as finches ordinarily don't cross large stretches of open water). The different islands had different plant life (one island had more cactuses, the other had more nut-bearing trees, you get the point) and thus, over a period of time, the finches adapted accordingly to the available plant supply: so much as that one specie developed a strong crushing bill, the other developed a slender beak capable of picking cactus spines to dig out insects. Their behavior, also, have greatly changed -- the nut-eating variety would have lived on the ground where fallen nuts are in abundance while the spine- using one would 'learn' how to use spines as a possible tool for catching insects. After the long geographic isolation, it is possible to 'reunite' this long-lost 'family members' and try to breed them, which of course fails because of the differences in mating behaviour, as well as the differences in their genetic codings. Thus, change is a significant and primary cause in the 'branching' of an original specie into different specialized organisms.
