Saber-toothed cats suffered from high rates of congenital spinal deformities and rare nerve tumors near the end of the last ice age, pointing to sustained inbreeding as populations shrank, according to a study published in Frontiers in Veterinary Science. Researchers analyzed more than 3,700 vertebrae from Smilodon fatalis specimens recovered from Los Angeles’ La Brea Tar Pits, as reported by Science.
Spinal Deformities and Nerve Tumors in La Brea Fossils
The study documents health anomalies in the ancient predators as their numbers dwindled. Spinal nerve tumors, which occur at a rate of 0.38 per 100,000 individuals in modern humans, appeared in the saber-toothed cat sample at a rate of 353 per 100,000 individuals, according to Science News. Two of the three fossils displaying evidence of these tumors date back 12,000 and 13,000 years, landing close to the timeline of the species’ extinction.
Did you know? Researchers examine thousands of bones from the La Brea Tar Pits to reconstruct prehistoric predator health, leveraging natural asphalt traps that preserved skeletal populations.
Impact of Genetic Squeeze on Hunting Mechanics
The documented abnormalities made movement painful and hunting difficult for the giant cats, per the study findings. Because of these difficulties, the afflicted predators likely had to rely on easy meals. According to researchers, this included targeting animals already mired in tar, creating a feeding strategy during their final millennia.
Parallels to Modern Endangered Carnivores
While the broader impact across all ancient saber-toothed cat populations remains unclear, experts note that the data offers a crucial historical window. According to Science News, the findings serve as an ancient warning regarding the modern genetic squeeze facing today’s embattled big carnivores.
Frequently Asked Questions
What caused the high rate of tumors in saber-toothed cats?
Researchers link the conditions to sustained inbreeding as Smilodon fatalis populations shrank near the end of the last ice age, according to Science.
How common were spinal nerve tumors in the La Brea sample?
The tumor rate reached 353 per 100,000 individuals in the fossil sample, which is roughly 1,000 times higher than the occurrence rate in modern humans, per Science News.
When did these heavily affected cats live?
Two of the three fossils showing tumor evidence date to 12,000 and 13,000 years ago, shortly before the species vanished entirely, according to reporting by Science News.
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