So I saw this report that the white Yangtze dolphin is functionally extinct.
Critters go extinct as a function of time no doubt. In fact, if catastrophy or other natural changes in our earth don't kill off organisms first, they will evolve into new species within 2 to 10 million years. Evolution limits the age of all organisms at the species level to that amount of time.
But when a large animal is driven to extinction as a consequence of our unnatural actions, we have all lost something important.