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 ...

2 1/2 x 13 x 4 3/4 in. (6.4 x 33 x 12.1 cm.) ...

What's with the tusk? Narwhals (in the Arctic Ocean) have inspired myth and wonder but are still little known to science. Flip Nicklin / Minden Pictures Even before the hunters were off the phone ...