frank, thank you very much for that. scientists say they have seen a remarkably large number of blue whales in the southern atlantic oceanears ago, reducing the numbers from nearly a quarter of a million to just a few hundred. we can now speak tojennifer jackson, who is the scientist in charge of the study. shejoins me from cambridge. very good to have you with us. what exciting and encouraging news for all of you looking at the population of blue whales. tell us more about the survey and whether you ever imagined you would see this many blue whales. absolutely not. so, the survey was conducted over 23 days in south georgia waters, and it was designed to maximise the amount of area that the team could cover, and gather as much data as possible about the whales feeling in that area in the summer. so it is involved an expert in collecting skin samples, and satellite tracking animals, in using a drone to get the whales from overhead to assess health. we were looking for the southern right whale, another elusive animal recovering from wailing, but in fa ct, recovering from wailing, but in fact, we found over 23 days, as you