It’s hard to miss a musk ox: It looks like a buffalo decked out in a hairy fur coat. And yet this easy-to-spot giant, which lives on tundras from Siberia to Greenland, is still surprisingly mysterious ...

“Here is the largest land mammal of the polar zones, but we hardly know anything about musk oxen,” said Joel Berger, a wildlife biologist at Colorado State University and a senior scientist at the ...