Whale spotting: Witnessing one of nature’s great migrations

Right now, about a hundred thousand humpback whales are out there having a whale of a time. Their great migration, which seems to get bigger every year, is also an important reminder of what the world almost lost. Up until the 1960s humpbacks were hunted to the point of extinction. As few as 300 were left in our waters. How things have changed though, and as Adam Hegarty finds out, watching these magnificent creatures is guaranteed to make anyone smile.