"Crake made the bones of the Children of Crake out of the coral on the beach, and then he made their flesh out of a mango. But the Children of Oryx hatched out of an egg, a giant egg laid by Oryx herself. Actually she laid two eggs: one full of animals and birds and fish, and the other one full of words. But the egg full of words hatched first, and the Children of Crake had already been created by then, and they'd eaten up all the words because they were hungry, and so there were no words left over when the second egg hatched out. And that is why the animals can't talk."
--Oryx and Crake (Margaret Atwood)