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.

Koala and Curlew, two endangered female North Atlantic right whales have gone off course, perplexing researchers.

There are several distinct traits that make mammals different from other animals, with the most significant ones being that ...

Lethal entanglement in lobster fishing gear is one of the biggest threats to the North Atlantic right ... the whales' survival because it takes place during months in which the giant animals ...