* Data is Limited: Global data on hair color and texture is not consistently collected or tracked.
* Overlapping Traits: Curly red hair is a combination of two relatively rare traits, making it even less common.
However, based on available information and estimates:
* Red Hair: Only about 1-2% of the world's population has red hair.
* Curly Hair: The percentage of people with curly hair varies significantly by ethnicity and geographic region. It's more common in some areas than others.
Given that only a small percentage of people are redheads, and an even smaller subset of those have curly hair, a reasonable estimate for naturally red curly hair would be well under 1% of the world's population.
It's likely a very rare combination!