Is it permissible to sell eggs of rare and expensive bird species when both parties are aware of the possibility that the egg may not be fertilized?

It is not permissible to contract for eggs for the purpose of chicks, due to the harm and uncertainty involved, which are the reasons for the prohibition of most transactions. This falls under the category of gharar (uncertainty) sales, which the Lawgiver has forbidden. It also takes the ruling of buying what is in the bellies of animals, which has been prohibited. Therefore, it is not permissible to sell eggs for this purpose, whether fertilized or not, and whether both parties are aware of this or ignorant of it.