Birds regenerate hair cells within days to a month through identified essential pathways.

“Birds & Hair Cell Regeneration”

“Indeed. And numerous studies have shown that birds really regenerate their hair cells. And one of our investigators at Stanford, Stefan Heller, recently published a paper describing the specific pathways that are absolutely essential for this in birds. So in birds, we really have nailed it in terms of understanding the specifics. And birds do it quickly. They regenerate their hair cells within days. Within a month, they're done.”