Science Snapshot: Mastodons on the Move

It can be hard to discern the daily lives of extinct species just by looking at fossils, but studying isotopes within their ancient bones can help paint a broader picture. According to a new study published Monday (June 13) in PNAS, American mastodons (Mammut americanum) migrated great distances throughout the year. To uncover this, researchers analyzed isotopes of strontium and oxygen along the length of a tusk from a 34-year-old male mastodon from the Indiana State Museum, which museumgoers affectionally call “Fred.” These isotopes occur in different proportions based on an area’s geology and the time of year, and they get incorporated into mineralized tissues, so they can serve as markers for the habitats animals were in when their bones grew. The recurring patterns of isotopes in the tusk suggested the animal traveled great distances on a regular basis, particularly once it hit adulthood. It ultimately died in what is ...