Woolly mammoth dental enamel from Poland has shown that woolly mammoths were seasonally migratory. Recurring shifts in δ18O and 87Sr/86Sr found in layers from the enamel correspond to seasonal versions and reveal that Polish woolly mammoths inhabited southern Poland throughout Wintertime but grazed the Polish midlands all through summer months.[fifty https://www.youtube.com/channel/UCCoZfLHRsYsRsVHqS-CSAWA