It's always quite frustrating when media outlets truncate the title of Darwin's seminal work to just "Origin of Species".
Do you want them to refer to it as, “On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life?” Even Darwin himself had it shortened to simply “On the Origin of Species” by the 6th edition.
It’s standard practice to shorten book titles to a more familiar handle. Hence, we speak of “Robinson Crusoe,” rather than “The Life and Strange Surprizing Adventures of Robinson Crusoe, Of York, Mariner: Who lived Eight and Twenty Years, all alone in an un-inhabited Island on the Coast of America, near the Mouth of the Great River of Oroonoque; Having been cast on Shore by Shipwreck, wherein all the Men perished but himself. With An Account how he was at last as strangely deliver’d by Pyrates.” (Yes, I cut and pasted the real titles out of Wikipedia.)