Chimpanzees Drink Beer: Daily Behavior Explained
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Chimpanzees Consume Ethanol through Fruit, Suggesting Evolutionary Link to Human Drinking
The Finding: Ethanol Consumption in Wild Chimpanzees
Scientists from the University of california have discovered that wild chimpanzees are regularly consuming ethanol through fallen fruits in their natural habitats. The research, conducted in the Taï region of Ivory Coast and Ngogo, Uganda, focused on analyzing the ethanol content of fruits consumed by local chimpanzee populations.
The study, as reported by Autonomous, revealed that both male and female chimpanzees ingest approximately 14 grams of pure ethanol daily.This equates to roughly one standard alcoholic drink as defined in the United States.
Which Fruits Are the Source?
Figs and Guinea plums were identified as having the highest alcohol content among the fruits consumed by the chimpanzees. These fruits undergo natural fermentation, resulting in the production of ethanol. However, the study notes that the relationship between alcohol content and fruit selection isn’t fully understood.
Researchers are still investigating whether the chimpanzees consciously select fruits based on their alcohol content or if the preference is linked to other factors,such as sugar levels or nutritional value. The interplay between these factors remains a key area of ongoing research.
Aleksey Maro, a graduate student involved in the research, suggests a compelling link between chimpanzee ethanol consumption and human drinking habits. He posits that the interest in alcohol may be rooted in the nutritional heritage shared by humans and chimpanzees.
“People’s interest in drink is probably due to this nutritional heritage of our common ancestors with chimpanzees,” Maro stated. This suggests that the ability to process and possibly benefit from ethanol may have been present in our common ancestors.
Considering the size difference – chimpanzees averaging around 40 pounds compared to a typical human weight of 70 kilograms – the equivalent daily ethanol intake for a human would be approximately two standard drinks.
data on Ethanol Content in Fruits
The study examined 21 different fruits, finding an average ethanol content of 0.26 percent. However, the levels varied significantly between fruit types, with figs and Guinea plums consistently exhibiting higher concentrations. The following table summarizes the average ethanol content observed in the examined fruits:
| Fruit type | Average Ethanol Content (%) |
|---|---|
| Figs | 0.45 |
| Guinea Plums | 0.38 |
| Other fruits (Average) | 0.15 |