Every year in the Antartic, as winter closes in and food becomes scarcer, one of the worlds great migrations takes place.Many hundreds of humpback whales swim 6000 km north to spend 4-5 months enjoying the warmer and food-rich waters of French Polynesia, to breed and to give birth to their calves. This is a time for mating, with underwater singing that can be heard all day long as the males try to impress the females.
