Spinal Tumors Reveal Inbreeding Crisis in Extinct Saber-Toothed Cats

In the ancient tar of La Brea, the bones of saber-toothed cats carry a quiet confession: that the end of a species is rarely a single catastrophe, but a slow unraveling from within. Scientists examining thousands of fossilized Smilodon vertebrae have found spinal nerve tumors at nearly a thousand times the rate seen in modern humans — a biological signature of inbreeding so severe it suggests these great predators were genetically compromised long before they vanished. The discovery asks us to consider that extinction is not merely an event, but a condition that accumulates invisibly, and that