>>19862828Speciation doesn't happen in such a short time, for something to be considered a separate species it needs to be sexually incompatible with the other population. If you isolated the moths for centuries then you'd start seeing more appreciable differences.
The fruit fly experiment shows that once reintroduced, the flies prefer their own kind which leads to reproductive isolation. Multiply the isolation by a few orders of magnitude and they'll become completely incompatible, leading to the definition of a separate species.
