Attenborough, I greatly admire how egg structure protect the new life from the outside world, but at the same time allowing the inside of the developing bird's breathing. The egg is strong enough to withstand brooding mama bird's weight, but enough to be brittle, so that the chicks will be able to break its shell in frustration.
Attenborough explains how the egg is formed, how it is built and why it is just egg shaped. The document follows the egg to the formation of the moment for chicks to hatch different bird species for example.Attenborough visits the brooding swan nest outside. YLE
the World's smallest egg is the bumblebee kolibrilla. Its egg weighs just under half a gram. The largest egg is an ostrich and it is 40 000 times heavier.
the Birds are warmer than mammals. An adult bird's body temperature is around 40 degrees. So warm the fetus does not develop, so the eggs by the birds can brood spawn at lower temperatures.
the Albatross is a bird of the world sperm jemmaaja. Female birds store after mating the sperm in his system. Mating and the fertilized egg oviposition interval may be up to two section. During this period the female will collect the eggs for the necessary building materials.
Prism: Attenborough and the eggs of wonder TV1, respectively on Wednesday at 19.