Blue Whale: World's largest heart on display in rare exhibitionTo play this video you need to enable JavaScript in your browser.This video can not be playedBlue Whale: World's largest heart on display in rare exhibitionCloseThe discovery will help scientists understand more about the blue whale's physiology.SubsectionUS & CanadaPublished6 August 2017Shareclose panelShare pageCopy linkAbout sharingRead description