I know you want to take the long way home in the hopes of getting lost in a gray area somewhere, but I won't play silly games.
There's no need to go back to species definitions because camels, dogs and humans are already adequately classified.
I did not ask for a specific species definition, I asked for what defined the species. That is essentially what is being "discussed".
It is in part the characteristics of the animal that put it into a species. These are changed routinely(in the sense of a characteristic of a species). Feathers used to be defining for birds, now some want to remove it from that level. Cusps on teeth were used to define mesonychus. etc.
A polite question. Have you caught something from Vade? Please search this page. Find the pronoun "you".