People jerry coyne, ernst mayr, douglas schemske, dolph schluter. Hawaiian honeycreepers have all descended from a single species of finch in the last 10 million years. I look at the term species, as one arbitrarily given for the sake of convenience to a set of individuals closely resembling each other darwin 1859. When we understand the origin of reproductive isolating factors, we understand the origin of species coyne 1992. The species problem involves the problem of how best to define a species. Question occurs: how big of the difference does it need to be considered as different . Doesn"t work for plant because they can be crossed easily. Concepts vary among different groups of organisms - no universal species concept. A group of interbreeding natural populations that are reproductively isolated from other such groups ernst. * although mayr first formally defined the bsc, dobzhansky first suggested the idea. Isolation does not have to be absolute.