By Jonathan O’Callaghan from NYT Science https://ift.tt/cS8ridg via IFTTT
Fossils reveal how tusks first evolved and why they are unique to mammals
Warthogs, hippopotamuses, Arctic-dwelling walruses and hyraxes all have tusks
More at https://www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=303916&WT.mc_id=USNSF_1
This is a Research News item.
Read more at nsf.gov
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