Humpback whales are famous for two things: their giant leaps and their songs. A humpback can fling its enormous body completely out of the water - a move called 'breaching' - and land back with a crash you can hear from far away. Scientists are still not sure why they do it. They might be talking, playing, or shaking off barnacles.
Their songs are long and complicated - some are over 30 minutes long, with lots of repeating parts, like a song you would learn in music class. All the males in one part of the ocean sing the same song, and the song slowly changes year by year. Whale researchers can recognise individual whales by their tunes.
From the town of H煤sav铆k in northern Iceland, people can go out in small boats and watch whales feeding. Humpbacks eat tiny fish and even tinier shrimp-like creatures called krill. They take huge gulps of seawater, then push it back out through bristly plates in their mouth, keeping the food in.
Each humpback's tail is unique - the pattern of black and white on the underside is like a fingerprint. Scientists photograph the tails as the whales dive, and use them to track individual whales as they travel between Iceland and the Caribbean, year after year.