Retracing a Mastodon’s Steps With Chemistry

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Thanks to strontium, oxygen, and rings in a tusk, scientists now have evidence that extinct mastodons may have participated in yearly migrations.

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Image Sources:
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https://commons.wikimedia.org/wiki/File:Mastodon_Tusk_%28Ivory%29_2016-10-13_2279.jpg
https://commons.wikimedia.org/wiki/File:Male_%26_female_mastodons,_front.jpg
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