What could that be?

In a clearing in the forest, there is something small and dark, but none of the animals know what it is, perhaps a leopard's spot or a dragon's egg, so they all react with fear and anxiety--and so the object is still there, even to this day.

Bibliographic Details
Main Author: Dalvand, Reza
Format: BOOK
Published: Orchard Books, an imprint of Scholastic Inc 2020