Smithsonian on Instagram: "With a scientific name meaning “thick-headed lizard” and a domed head often compared to a bowling ball, Pachycephalosaurus lived alongside species like Tyrannosaurus rex and Triceratops 67 million years ago. Today, our @SmithsonianNMNH has acquired a remarkably complete skull of Pachycephalosaurus. The rare fossil was donated to the museum by Eric and Wendy Schmidt. Visitors will have a chance to see the new Pachycephalosaurus skull up close starting Dec. 22, when the

As winter approaches and the wind drives temperatures down to minus 30 degrees Celsius, most animals have already migrated to survive, but the reindeer remain. Their double-layered coat provides insulation, and their wide, splayed feet act as natural snowshoes, helping them navigate the mountain plateau in search of the best winter food. Much of the time, they lie still to conserve energy, but when the wind drops, the herd comes alive. At this time of year, it is the females who take charge. Wit