Thanks.

We crushed the egg shells a bit and tossed them in the pen.

It would be interesting to know if other birds were as thrilled.

The students had to create a device to throw three chicken eggs at a target and have them stay without breaking. They were allowed quite a bit of latitude on how to protect the eggs.
One group went to an egg farm and asked if there was any way to harden the shells. They were told some of the hens were fed ground shells from shell fish especially oysters and clams. They bought a gross of the eggs and set to designing their apparatus.
I never found out the commercial reason for hardening the shells but their creative bending of the rules was only partially successful. As I remember only two of their eggs stayed on the test bed, one surface of which was slanted.

https://www.thetech.org/education/the-tech-challenge/past-challenges/

“Asteroids Rock” was the specific challenge I was part of the judging team for.