terry okada reports. amazing video is helping researchers track and remove the polar bears make. >> reporter: with temperatures at 20 degrees below zero this is the -- as close to a polar bear that scientist can get. new insight into how the threatened species hunts and mates. >> it is fascinating to learn the basic behaviors of these animals. >> reporter: the u.s. geological survey followed nine female polar bears off the coast of alaska. at springtime, over a three- year period. they log animals behavior, which is vital for hunting. >> how often they are catching seals. how often they are trying to catch seals. >> reporter: scientists found climate change and shrinking ice cover are making it impossible for bears to catch enough prey to meet their bodies needs. they lost weight instead of putting on the pounds needed to reproduce, care for cubs, and survive harsh winters. zookeepers in britain say at some point bears and captivity may be needed to help boost the wild population. they created a state of

thousands of young men who capitalize on the overcrowded roads by working as a motorcycle taxi known as an okada

alexis okada law. -- my book. jan of the wylie agency and michelle amaro and my friends and family who are so supportive during the extent before and in writing of this book. i wanted to tell a different story about africa that humanized and portrayed people on the continent and tucked away under and about the way they had agency wanted to fight back against their situations. that took me all over the continent, including doing things like wandering around boca d. show about a security escort, but it worked out and i didn't know people would get the story, but they did and i appreciate the train to america is one of the bodies they got through that story. thank you so much. [applause] >> in our final word of the evening, the pen jean stine book award. this comes at the $75,000 grant generously funded by bill clegg and katrina banning google in the audience this evening. [applause] it is given to an author or book length work of any genre that has broken new ground in signal strong potential for lasting influence.