In this March 28, 2018 file photo, a North Atlantic right whale feeds on the surface of Cape Cod bay off the coast of Plymouth, Massachusetts. Credit: Michael Dwyer / AP

The first baby whales of the season that belong to a critically endangered species have been born off Georgia and Florida.

The rare North Atlantic right whales were spotted on Dec. 4 and Dec. 7, the National Oceanic and Atmospheric Administration said. The whales number only 366 and their population has declined in recent years.

The whale calves were spotted swimming with their mothers off Cumberland Island, Georgia, and Vilano Beach, Florida, NOAA said. The whales move north to New England and Canada to feed in the spring.

The right whale population was decimated during the commercial whaling era. They now face threats such as ship collisions and entanglement in fishing gear.