vyöryvöitä
Vyöryvöitä is a Finnish term that translates to "avalanche moths" or "rolling moths." It refers to a specific type of insect behavior observed in certain moth species, particularly in conditions of high population density. When a large number of larvae hatch simultaneously, they can emerge in massive swarms. These swarms can appear to "roll" or "flow" down vegetation or across the ground, creating a striking visual effect.
This phenomenon is primarily associated with the larvae of hawk moths (family Sphingidae) and some other moth
Vyöryvöitä can sometimes cause significant defoliation of trees and plants in the affected areas. While visually