What is a primary distinguishing feature of the granary weevil?

The granary weevil is primarily distinguished by its lack of the ability to fly, which is a notable characteristic among this species. Unlike many other beetles and weevils, granary weevils have small, non-functional wings that do not support flight. This adaptation allows them to focus on reproductive success and resource competition in their preferred environments, primarily where stored grains are found.

In contrast to this feature, other traits such as the presence of long antennae, brightly colored wings, or larger size than other weevils are not characteristic of granary weevils. Their small wings reflect their adaptive evolution for a lifestyle that relies on staying within a limited range, mainly around grain storage. Thus, the lack of flight reinforces their role as pests in agricultural settings, where they exploit stored food sources. The granary weevil's inability to fly is a key aspect of its biology and behavior, making it a distinctive pest in the realm of entomology.