"I think we've identified a real physiological challenge here and we're going to pursue the details of that to see if we can figure out what's going on," Dr Williams said. For narwhals and other ...

Our marine mammal expert Richard Sabin takes us through what scientists know – and don’t know – about narwhals, also known as unicorns of the sea. Ask a world-leading scientist a silly question, get a ...

They are elusive, but the "unicorn" of the sea not only exists in some of the coldest water on earth but thrives.