Explained: Scientists discovered an unknown baby right whale off Canada. They say it's a cause for joy

Researchers captured images of an unidentified baby North Atlantic right whale off Anticosti Island, Quebec in September

North Atlantic right whale

One of the rarest sea mammals in the world, with only about 380 left

calving grounds

Areas off the southeastern U.S. where right whales give birth in winter

entanglement

When whales become caught in commercial fishing gear, a major threat to the species

Mingan Island Cetacean Study

A nonprofit research organization in Quebec's Côte-Nord region that spotted the calf