1Every single year, humpback whales travel thousands of kilometres between their feeding and breeding grounds.
2During the summer, they feed in cold polar waters that are rich in small fish and krill.
3They eat enormous amounts because they must store enough energy for the long journey ahead.
4When winter approaches, the whales leave the icy seas and swim towards warm, shallow waters.
5There the females give birth to their calves, safe from hungry killer whales and winter storms.
6A newborn calf drinks hundreds of litres of rich milk from its mother every single day.
7The young whales grow quickly and learn to breathe, dive and communicate with their mothers.
8Male humpbacks sing long, complicated songs that can travel for great distances through the ocean.
9Scientists still do not fully understand why the whales sing or how they learn new songs.
10By tracking these migrations, researchers hope to protect the whales' routes from ships and fishing nets.