Births among endangered right whales highest since 2015

A North Atlantic right whale mother and calf in waters near Wassaw Island, Georgia (Georgia Department of Natural Resources/NOAA Permit #20556/AP)

North Atlantic right whales gave birth over the winter in greater numbers than scientists have seen since 2015.

It is an encouraging sign for researchers who became alarmed three years ago when the critically endangered species produced no known offspring at all.