50 years ago humpback whales were considered an endangered species after decades of commercial whaling decimated the population. around that same time scientists learned something extraordinary. whales were communicating with each other, sometimes by song over long distances. in part because of that discovery scientists and conservationists rallied to enact laws to protect the whales, and it worked. the humpback whale population has made a remarkable comeback. but now they face a host of new threats. global warming is killing off their food source, and human activity is causing thousands of whale deaths a year. from the stress of underwater construction noise to fishing entanglements and ship collisions. in the next hour cnn s bill weir takes us to antarctica, a place very few people get to visit, to study these remarkable creatures and show us why saving the whales may also be saving the planet. because they are one of our best partners in battling climate change. reporter
moment? reporter: they described it as concerned. doctors concerned about the queen s health. they very rarely put any statements out about her health and they never speak in such stark language. so that is very concerning. we also know that the queen is at the castle, she is overseeing by medical attention. she is not being taken to the hospital. read into that as bull. the biggest concern is that all the family have dropped everything that they were doing and they headed immediately to balmoral. prince charles is already there as is princess ann. i understand other members of the royal family landed at the airport about an hour away. i don t expect to get any more update until the whole family are within the castle and they have been informed personally about what is a big family moment. we can also read into the fact that prince harry and meghan have also dropped everything, also heading to scotland. and putting all their personal differences with the rest of the family