Sabre-toothed cat’s teeth growth rate

The terrifying, dagger-like teeth of the sabre-toothed cat Smilodon fatal is grew at twice the rate of those of modern big cats, a new study has found.

However, the teeth in the prehistoric species emerged later in life and even despite their relatively fast growth-rate, the canine teeth were not fully developed until the cat was three years old.

The findings, published today in the journal PLOS ONE, are based on a new technique that combines isotopic analysis and x-ray imaging. It provides for the first time specific ages for developmental events in Smilodon, notably in their teeth.

The study estimates that the eruption rate of permanent upper canines was six millimeters a month – double the growth rate of an African lion’s teeth.

“For predators such as big cats, an important determinant of an individual’s full hunting ability is the time required to grow their weapons – their teeth,” said Z. Jack Tseng, a National Science Foundation and Frick Postdoctoral Fellow in the American Museum of Natural History’s Division of Paleontology and a coauthor on the new paper.

“This is especially crucial for understanding sabre-toothed predators such as Smilodon.”

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