Gibraltar Monkeys Eat Soil: Junk Food Diet Leads to Strange Behavior

Top Summary

• What happened: Monkeys in Gibraltar, frequently fed junk food by tourists, have started eating soil.
• Why it matters: This behavior suggests the monkeys are self-medicating to cope with digestive issues caused by unhealthy diets.
• What changes for people: Highlights the negative impact of feeding wild animals inappropriate food.
• Who is affected: The Barbary macaque population on Gibraltar, and potentially other wildlife reliant on tourist interactions.

Unnatural Diet, Unnatural Behavior

Troops of monkeys living on the Rock of Gibraltar have developed an unusual habit: eating soil.

Scientists believe this behavior is an attempt to settle their stomachs after consuming large amounts of junk food. This junk food is often provided – or stolen – from tourists.

Geophagy Observed Among Tourist-Exposed Macaques

Researchers observed this intentional mud eating, known as geophagy, while studying groups of Barbary macaques in the territory.

The study revealed a correlation: monkeys with the most contact with tourists consumed the most soil. Consumption peaked during the holiday season.

The Macaque Population of Gibraltar

Approximately 230 macaques live on Gibraltar, divided into eight distinct groups.

While local authorities provide daily rations of fruit, vegetables, and seeds, tourists frequently offer snacks such as chips, chocolate bars, M&M’s, and ice cream.

Protective Effect on Digestion?

The observations don't definitively prove why the monkeys eat soil, but scientists suspect it has a protective effect on their digestive systems.

The group isolated from visitors and tourists was the only one where soil consumption was not observed.

Quote

"This behaviour highlights the detrimental impact of unregulated feeding of wildlife. While seemingly harmless, these actions can lead to unexpected consequences for animal health and behaviour."

What to Watch Next

Further research is needed to confirm the exact reasons behind the geophagy and to assess the long-term health implications for the macaque population. Authorities may consider stricter regulations on tourist feeding to protect the monkeys' well-being.