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Technological advancements in the past decade have now made it possible to date the oldest of the tools to about 20,000 years ago. Scientists found that the bones came from blue whales, fin whales, sperm whales and other species.

“Humans and whales have clearly been encountering one another for a long time,� said Vicki Szabo with Western Carolina University, who studies the history of whaling and was not involved with the latest research.

Scientists think that ancient humans were crafting whale bone instruments in places including the Arctic and South Pacific. There’s been solid evidence of whale bone tools dating back to about 5,000 years ago, but the new research published Tuesday in the journal Nature Communications pushes the timeline back.

Ancient humans weren't necessarily hunting whales, said study author Jean-Marc Petillon with the French National Centre for Scientific Research. More likely, they were scavenging the bodies of beached whales and fashioning their dense, heavy bones into tools to hunt reindeer or bison.

The tools indicate that ancient people in the area took advantage of resources near the sea for survival. They likely also collected seashells and fished. Finding such evidence has been difficult as rising sea levels disrupt coastlines across the globe, scientists said.

“It’s one more contribution to the importance of coastal environments for human groups, even in this long past," said Petillon.

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