What type of insects are noted for having scales that rub off easily?

Butterflies and moths are known for their distinctive scale-covered wings, which are a defining characteristic of their anatomy. These scales are minute and can easily rub off when the insect makes contact with surfaces or is handled. This trait is notable because it contributes to the vibrant coloration and patterns observed on their wings, which are often used for camouflage, mating displays, and other behavioral functions.

The scales are actually modified hairs and are crucial to the insect's ability to fly, as they can affect aerodynamics and help with thermoregulation. Because these scales can be dislodged with minimal friction, it's not uncommon to find colored dust on surfaces that butterflies and moths have contacted. This characteristic underscores the biological adaptations that have evolved in these insects, making them unique within their ecological niches.