North Atlantic Right Whales are one of the most endangered whale species in the world.

But now their numbers are growing again, thanks to a plan to keep large ships away from the whales’ nursery and feeding grounds.

For many years the whales were hunted for their oil. Hunting was banned in 1937, but by the 1990s there were only a few hundred North Atlantic Right Whales left.

The whales live in the Atlantic Ocean, off the eastern coast of Canada and the United States. They spend the winters in warm southern waters, where most calves are born, then migrate north in the spring.

Many Right Whales spend each summer and fall in the Bay of Fundy, a large inlet of the Atlantic Ocean between the provinces of New Brunswick and Nova Scotia. The water there has large amounts of plankton – tiny organisms that are an important part of the whales’ diet.