When we think of hyenas, we usually picture them in the savannah or in a dry environment surrounded by lions or elephants, but this has not always been the case. Thanks to new research, we now know with certainty that ancient hyenas once lived in the Canadian Arctic regions.
The study led by the University at Buffalo reveals that two ice age fossil teeth discovered in Yukon Territory, inside the Canadian Arctic circle belonged to the so-called “running hyena” Chasmaporthetes. The discovery helps us understand how these animals reached North America from Asia.
We spoke to Jack Tseng, the first author of the study and assistant professor of pathology and anatomical sciences at the University at Buffalo.
This ice age fossil tooth — tucked away for years in the collections of the Canadian Museum of Nature. This tooth, found in 1977, and one other are the first known hyena fossils found in the Arctic. (Grant Zazula / Government of Yukon)
The discovery
These two fossils are not a new discovery in themselves. They were found almost four decades ago in the Yukon region among tens of thousands of fossils.
Most of the fossils that were subsequently studied and researched were large animals like mammoths, horses and camels. And these teeth being very rare and from, a potentially rare specie, that needed special attention were simply not studied in depth at the time.Jack Tseng, assistant professor of pathology and anatomical sciences at the University at Buffalo
The two fossils were first identified as belonging to some kind of hyenas and were stored in the collections of the Canadian Museum of Nature in Ottawa, Ontario.
It is not until last February, when Jack Tseng came to the Canadian capital and compared the two fossils to a global sample of hyena fossils found elsewhere, that they were able to pin down exactly the identity of this particular hyena.
Jack Tseng, Assistant Professor of Pathology and Anatomical Sciences at the University at Buffalo explains how they made this discovery. (DOUGLAS LEVERE/University at Buffalo)EN_Interview_4-20190618-WIE40
Understand how hyenas got to North America
Scientists long suspected that hyenas crossed from Asia to North America thanks to discoveries of fossils on both sides of the Pacific: in southern North America, on the one hand, and in Asia, Europe and Africa on the other.
This kind of migration was not unique to these mammals as many animals did the same over the years. Scientists think they did so when they discovered new environmental opportunities, new areas. In the case of these hyenas, the assumptions are that they moved when a geologic bridge formed between North America and Asia as sea levels changed, explains M. Tseng.
And this kind of migration also applied later to early humans who colonised North America by travelling on foot.
They must have crossed over Beringia, the northern region between Yukon, Alaska and Siberia at one point. It’s just that we’ve never had physical evidence to show when and how that migration may have occurred.Jack Tseng, assistant professor of pathology and anatomical sciences at the University at Buffalo
This tooth, found in 1973, and one other are the first known hyena fossils found in the Arctic. (Photo: Jack Tseng)
But thanks to this new discovery, scientists now have evidence of this migration, but it also helps them to better understand hyenas.
These two fossils essentially gave us now hard evidence that these hyenas were not only able to travel through the region, perhaps they were there, they lived there, up the Yukon in the Arctic circle, long enough that they were actually preserved as fossils. And that changes our basic assumption about how hyenas were able to live.Jack Tseng, assistant professor of pathology and anatomical scienc...