No Association between 2D:4D Ratio and Hunting Success among Hadza Hunters

Area of Science:

• Evolutionary Anthropology
• Human Biology
• Behavioral Ecology

Background:

• The 2D:4D ratio, or digit ratio, is linked to prenatal androgen exposure, with men typically having lower ratios than women.
• Previous research suggests an inverse relationship between 2D:4D ratio and athletic ability, and theorizes a similar link to hunting skills in hunter-gatherer populations.
• Existing studies have not directly tested this hypothesis in actual hunter-gatherer groups using ecologically valid measures of hunting success.

Purpose of the Study:

• To investigate the relationship between the 2D:4D ratio and hunting ability among the Tanzanian Hadza hunter-gatherers.
• To assess hunting reputation and specific hunting skills using a novel, granular assessment method.

Main Methods:

• Assessed the 2D:4D ratio in Tanzanian Hadza men.
• Employed a new method to evaluate hunting reputation, allowing for detailed differentiation among hunters.
• Measured two key hunting skills to provide ecologically valid indicators of hunting performance.

Main Results:

• No statistically significant relationship was found between the 2D:4D ratio and hunting reputation.
• The digit ratio did not correlate significantly with the two assessed hunting skills.
• Hadza men exhibited higher mean 2D:4D ratios compared to men in many Western populations.

Conclusions:

• The study provides no empirical support for the hypothesized negative correlation between 2D:4D ratio and hunting skill in this hunter-gatherer population.
• The findings suggest that the 2D:4D ratio may not be a reliable predictor of hunting ability or success.
• Alternative explanations, such as allometric scaling, are considered for the observed digit ratios.