The success of an egg depends on how easily it can be broken, by the chick it has protected for months. Subscribe: http://bit.ly/BBCEarthSub #BBCEarth Watch more: Planet Earth http://bit.ly/PlanetEarthPlaylist Blue Planet http://bit.ly/BluePlanetPlaylist Planet Earth II http://bit.ly/PlanetEarthIIPlaylist Planet Dinosaur https://bit.ly/PlanetDinosaurPlaylist Attenborough’s Wonder of Eggs David Attenborough has a passion for birds’ eggs. These remarkable structures nurture…