From PBS Eons.
The story of the egg spans millions of years, from the first vertebrates that dared to venture onto land to today’s mammals, including the platypus, and of course birds. Like chickens? We’re here to tell you: The egg came first.
Thanks to Fabrizio de Rossi for the Hylonomus and Casineria illustrations!
Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios
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