Image: Neanderthal tooth
Tanya Smith / MPI for Evolutionary Anthropology
Different sets of imagery show growth lines inside a Neanderthal tooth (the diagonal lines at left) and on the outside (the horizontal curved lines at right). Measurements of these lines helped to determine that the child was approximately 8 years old when it died.
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updated 12/4/2007 9:16:11 PM ET 2007-12-05T02:16:11

A new analysis shows that the teeth of Neanderthal children grew faster than the teeth of human children today, suggesting that a long childhood and slow development are uniquely human traits.

Across all primates, including ourselves and Neanderthals, tooth development, specifically the age of molar eruption, is related to other developmental landmarks, such as weaning and first reproduction. Anthropologists have long debated the timing of such events in Neanderthals, with different evidence arguing for and against the idea that our distant cousins grew up differently from how we do.

To better understand Neanderthal tooth development, anthropologists at the Max Planck Institute in Germany examined the growth lines on the 100,000-year-old teeth of a juvenile found in the Scladina caves of Belgium.

They found that the duration of tooth growth was shorter for the Neanderthal compared to modern humans. This faster growth rate resulted in a more advanced pattern of dental development than in members of our own species — the Neanderthal child grew teeth over a shorter period of time and had more teeth present in its mouth than fossil and living humans of a similar age.

The Neanderthal child in the study appeared developmentally similar to a 10- to 12-year-old human, but is estimated to be only about 8 years old at the time of its death.

This new evidence, detailed Monday in the online edition of the Proceedings of the National Academy of Sciences, suggests that other aspects of physical development were also likely more rapid in Neanderthals than in humans (Homo sapiens), indicating that the slow development and long childhood of humans today is a recent condition uniquely evolved to our species.

"Given the well-established relationship between molar eruption and major events in life history, this work suggests that the Scladina Neanderthal developed more rapidly than living and fossil H. sapiens, experiencing a shorter childhood and a life history that was accelerated relative to that of H. sapiens," the authors wrote.

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