I recently learned about egg teeth.
In some species of birds, hatchlings grow an egg tooth, connected to their beak. This temporary tool helps them crack through their egg sac and then through the shell itself. Not long after, the tooth dries up and falls off. It’s equal parts weird and useful.
Sometimes, it takes a temporary tool to break open something lasting—an opportunity, a burst of adrenaline, or a flash of intuition. It’s a reminder that even fleeting things can serve an important purpose.
— Renee Roederer
Smuggling Grace 