Once driven to the brink of extinction, humpback whales have thrived in the South Atlantic since a worldwide moratorium on commercial whaling came into force in 1986, offering a bonanza to scientists who come each year to Brazil's Abrolhos archipelago to record and study the cetaceans.
Female humpback whales off the coast of Brazil now have their pick of mates, who slap the water with their tails and jostle for attention – a scene that would have been unthinkable a few decades ago.
