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Alarmed by Climate Change, Astronomers Train Their Sights on Earth

By Katrina Miller and Delger Erdenesanaa from NYT Science https://ift.tt/DVdbH1Y via IFTTT

Fossils reveal how tusks first evolved and why they are unique to mammals

Fossils reveal how tusks first evolved and why they are unique to mammals

Left side of the skull of a dicynodont from Tanzania. A large tusk is visible at the lower left. 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.

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