Well of course that after a time, a community is going to start having the same traits, if they get together with one another!
Hmmm just because Darwin said that, that doesn't mean it's true, you know.
And about orange nipples, the poor guy was so old he probably confused colors. Who has brown nipples anyways! There's only one color of nipples!
Actually two if you count pink and beige.
You know, nowadays there are many people arguing that the "Origins of species" is not always right, for example his intermediate-phase fossils theory (fossils that of course haven't yet been discovered). I even wrote a paper about this and read the book( I was, after all, a genetics minor).
In other words, maybe when Darwin saw "orange nipples" he was a lil drunk or a lil old:-p or maybe he was talking about monkeys:-D