INDRICOTHERIUM: A GIANT WITH A STORY IN ITS TEETH

Lower Jaw Teeth of Indricotherium

Imagine a rhinoceros tall enough to browse among the trees, with no horn and an appetite that must have kept it chewing for much of the day. 

Meet Indricotherium, a name often used for the giant prehistoric rhino now generally placed in the genus Paraceratherium. 

It lived in Asia during the Oligocene, tens of millions of years ago, and was among the largest land mammals ever to walk the Earth. Communications Biology

Despite its enormous size, this was no dinosaur. It belonged to the broader rhino family tree: an extinct relative of today’s rhinoceroses, rather than their direct ancestor. And while its towering body tends to steal the show, its teeth offer some of the best clues to how it lived.

First, the menu. Paraceratherium had relatively low-crowned cheek teeth. Tooth crowns are the parts above the gum line, and their height matters because food wears them down. Animals that spend their lives grinding abrasive grasses often have taller crowns to spare. 

Indricotherium

The giant rhino’s teeth fit better with browsing on leaves and other vegetation than with grazing on gritty grass close to the ground. 

That tells us the likely kind of food it ate, though a tooth cannot hand us an exact list of plants. Communications Biology

Then there are the front teeth. Its enlarged incisors were remarkably tusk-like. 

Fossil teeth can tell us more than what happened after a mouthful of food was taken: their shape also helps us work out how an animal might have gathered it. 

Exactly how this giant used those incisors remains an interpretation, but they are a useful reminder that “prehistoric rhino” did not mean “modern rhino, only bigger.”

We can also study wear on fossil teeth. Tiny marks and broader patterns of wear give clues about chewing and the abrasiveness of food, especially when compared with teeth from other mammals. 

Each method has limits: dust, grit and the foods eaten shortly before death can complicate the picture. The strongest reconstruction comes from putting dental evidence alongside the skull, the rest of the skeleton and the environment where the fossils were found.

So what do Indricotherium’s teeth tell us? This immense animal was likely a browser, equipped with a mouth quite unlike that of the horned rhinos we picture today. Its fossils preserve more than a record of size. They give us a glimpse of an Oligocene giant reaching for its next meal—and proof that, in palaeontology, a good set of teeth can be wonderfully revealing.

If you could examine one fossil to learn about an extinct animal’s daily life, would you choose a tooth, a footprint or a skull?