answersLogoWhite

0

It biodegrades. If the shells were up in a tree they will most likely get pushed out by the mother bird or the chicks comming out. They will fall to the ground and become compost for the earth. Most birds the size of cardinals or robins have such small eggs that when ground up and compacted it won't make up the same mass of your smallest finger's nail.

User Avatar

Wiki User

17y ago

What else can I help you with?