Little known today, trilobites were once the tastiest morsel left in the seas. Our link goes on to make the rather astonishing claim that, Trilobites are, "Extinct, but not a failure."
Roughly 250 million years ago, at the end of the Permian period, something killed 90 percent of the planet's species. Fewer than 5 percent of the animal species in the world ocean survived this Great Dying.
Nothing lasts forever, but the Trilobites are the world champions for surviving the longest on earth. Some researchers blame the rise of atmospheric CO2 for the Late Permian Extinction. They blame some sort of manmade climate change for intense global warming that led, inevitably, to Skynet and the rise of the Machines!