Feivel,
Lets forget about all the proofs there are that evolution happend for a minute.
Microevolution (small physical changes in animals shapes and colors caused by genentic mutations) has been observed in nature many times over.
Do you have any logical reason for beleiving that these small gentic mutations would stop adding up at the point were the animal would be so changed in appearance (and geneticly for that matter) that we would calassify the animal as another “specie”?
(Please note that the changes i am reffering to are genetic in nature and cannot be compared to say, working out your muscles.)