How often does a nest fall out a tree with a blue egg inside? I know its random, I mean, how many trees did people chop down before they got a nest with a blue egg in and where?

ive cut over 15k oak logs (for my 75 construction)

 

 

 

and ive gotten over 150 nests, but only one of thoses nests had an egg in it. but it wasnt blue :P

oh, its just in the chaos elemental letter, it says the blue egg will rise and it predicted future updates before...