In the Great Whale Sea off north Vancouver Island, the humpback whale populations have recovered dramatically from near extinction in the late '60s. Cetacea Lab works closely with the Gitga'at people in the Great Bear Rainforest to protect their territory. They listen to whales through hydrophones to learn more about whale behaviour. Each whale's tail has a distinct pattern, allowing the researchers to create a catalogue of the population, track their numbers and see which ones return to these nutrient-rich waters.