Why Are “Mashos” Swarming Cuenca?

The recent influx of “mashos” in Cuenca has sparked curiosity and some concern. According to experts, this unusual phenomenon is the result of intense rains following a prolonged drought, which triggered a synchronized hatching of nocturnal moths. Drawn to areas with bright artificial lights, these insects have created striking scenes across the city.

A Spectacle at the Cathedral

One of the most affected locations is the Cathedral of Cuenca. Its illuminated façade, domes, and other structures have become blanketed by “mashos,” forming a unique natural display that has caught the attention of both residents and visitors. Similar gatherings can be seen around streetlights, home lamps, and other well-lit areas.

Moth Species in Cuenca

The Entomology Laboratory at the University of Azuay (UDA) identified several moth species contributing to this event. These include Erinnyis ello (Sphingidae family) and five species from the Erebidae family: Gonodonta pyrgo, Eudocima procus, Neophisma tropicalis, Thysania zenobia, and Ascalapha adorata.

Biologist Edgar Segovia from the Catholic University of Cuenca observed up to 11 species on the Cathedral, with the potential for this number to grow to 22 species in urban and peripheral areas. The moths vary in size, with some, like Ascalapha adorata, boasting wingspans up to 24 centimeters.

Why Are There So Many?

The life cycle of these moths, combined with favorable weather conditions, explains the surge. Segovia predicts their presence will naturally decline within a month or so, as the moths only live for two to three months.

Recommendations for Residents

Experts advise leaving the moths undisturbed, as they pose no health risks and will soon disappear on their own. Nataly Aguilar, a biologist at the Amaru Biopark, highlights their ecological importance as pollinators, thanks to their ability to fly long distances and carry pollen.

Some suggest turning the phenomenon into a tourist attraction, similar to initiatives in Mexico, to showcase this natural event as a spectacle for visitors.

Additional Facts About “Mashos”

- Flight Capability: These moths can travel over 50 kilometers at night.

- Diet: In their larval stage, they feed on wild plant leaves. As adults, they consume flower nectar.

- Notable Species: The black masho (Ascalapha adorata) has a wingspan of up to 24 centimeters, while the gray masho (Thysania zenobia) measures 15–17 centimeters.

Source: El Mercurio.