Deep in the Pacific, humans have tracked a mysterious whale’s call for decades—but no other whale seems to respond. And now, we might be running out of time to find the source.

Researchers at Stanford University’s Hopkins Marine Station coined the term “White Shark Cafe” after noticing that great whites they had been studying gathered in one place to meet and mate. The ...

From mammoth African elephants to giant whales, let's take a look at the 8 largest mammals that inhabit our planet.