* Lack of Accurate Data: There isn't a comprehensive, continent-wide census for either species. Estimates are based on localized studies, which are difficult to extrapolate across vast regions.
* Vast Range and Diversity: Both squirrels and chipmunks have a wide range across North America, inhabiting various habitats with different densities.
* Seasonal Fluctuations: Populations fluctuate depending on factors like food availability, weather, and predation.
However, here are some general considerations:
* Squirrel Diversity: North America has a greater diversity of squirrel species compared to chipmunk species. This includes larger species like the gray squirrel and fox squirrel, which are likely more numerous than chipmunks.
* Chipmunk Adaptability: Chipmunks are more adaptable to a wider range of habitats, including forests, meadows, and rocky areas. This could potentially give them a wider distribution than some squirrel species.
Ultimately, it's impossible to say for sure which population is greater. The answer likely varies depending on the specific region and time of year.