What happen to flies back wings?

Answer 1

Flies possess a unique anatomical feature where their hind wings have evolved into small structures called halteres. These halteres function as balance organs, helping flies maintain stability and orientation during flight. By rapidly vibrating, halteres provide sensory feedback to the fly's nervous system, allowing for quick adjustments while maneuvering in the air. This adaptation is crucial for their agility and ability to navigate complex environments.