Ostrich Eggs?

Ostrich Eggs, Mopti Great Mosque, Mali

Mopti, Mali

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In Mali, the conical spires on top of a mosque's towers and even some of its conical parapets are frequently surmounted by one or two ostrich eggs. Used as a religious symbol in a number of faith traditions, including Islam, ostrich eggs might symbolize creation, life, resurrection, or vigilance. In Mali and other parts of the historical region of Western Sudan, the ostrich egg is said to signify purity and fertility.

Mosque Design Elements
Ostrich Eggs?