Song of one of rarest whales on planet recorded for first time

There are only about 30 north Pacific right whales left after hunters nearly wiped out the slow-moving animals

Marine biologists for the first time have recorded singing by one of the rarest whales on the planet, the north Pacific right whale.

Researchers at the National Oceanic and Atmospheric Administration (NOAA) used moored acoustic recorders to capture repeated patterns of calls made by male north Pacific right whales.