Now THIS is an odd and interesting question... When does, evolutionarily speaking, a species come to be?
In particular, when did an octopus come to be recognizably a different species than its predecessor?
And, from the perspective of SearchResearch, how would you search for such an event?
Once again, I haven't really solved this myself (yet), but will take notes as I work on this tomorrow morning.
(Thanks to my friend Alexis for the suggestion of this research challenge.)