'Any calf is a good sign. We count each one as a sign of hope. [But] we need a lot more,' says research scientist Philip Hamilton.

It's believed there are now fewer than 90 breeding females, and deaths have outpaced births in recent years.

NOAA says that the calf appears to have injuries to its mouth, which could hamper its ability to nurse and feed. 

The Arctic Report Card presents a bleak glimpse into a future marked by dead seals, bald patches and a large bloom of algae roughly the size of California.

Democrat senators Edward Markey and Warren sent a letter this week arguing Canadian rules for protecting the endangered whales are less strict than those in the United States.

Before its death, the whale was last seen on Aug. 6, entangled in fishing gear in Canadian waters in the Gulf of St. Lawrence.

Nine U.S.-based organizations have sent an 11-page letter to the National Oceanic and Atmospheric Administration expressing "deep concern" over the continued entanglement of right whales in Canadian waters.

After another summer of high mortality for right whales in Canadian waters, questions are being asked about whether Canada's slow response to the crisis could still be taking a toll.

The three-woman flight crew is gathering data on Hurricane Dorian, which is expected to slam into Florida on Monday.

Fisheries and Oceans Canada will attempt to install a satellite tag on the whale so they can continue to track it.