Encountering an insect that seems to pursue you can be startling. Many people report feeling as though a large “water bug” is actively chasing them, especially near lights. This article clarifies the true nature of this behavior.
Common “Water Bugs” and Their Identity
The term “water bug” often broadly refers to various insects, including large cockroaches. However, the insect most associated with “chasing” and painful bites is the Giant Water Bug (family Belostomatidae). These formidable aquatic predators have large, flattened, oval-shaped brown bodies. They use powerful pincer-like front legs for grasping prey and flattened, oar-like hind legs for swimming. Giant Water Bugs are found in freshwater ponds, marshes, and slow-moving streams worldwide, often hidden among vegetation.
Why They Seem to “Chase” You
Giant Water Bugs do not intentionally pursue humans with aggression. Their perceived “chasing” behavior results from natural instincts and flight patterns. They are strongly attracted to artificial lights at night, earning them the common name “electric light bugs.” They may mistake bright lights for celestial bodies used for navigation, causing them to fly erratically towards the illumination and, by extension, towards people.
These insects are powerful but unpredictable fliers. If disturbed or threatened, they may fly defensively and erratically, which can be misinterpreted as an attack. Their flight path can also appear directed toward a person accidentally, especially when disoriented by light or sudden movement. They may even mistake reflective surfaces, like wet pavement, for water and fly towards them.
Understanding Their Bite
Giant Water Bugs can deliver a very painful bite if handled or cornered. They inject digestive enzymes through their piercing, needle-like mouthparts, also known as a rostrum. This potent saliva helps them liquefy prey’s internal tissues. The bite’s sensation is a sharp, intense pain, comparable to or even worse than a bee sting.
While painful, the bite is rarely medically significant beyond temporary localized discomfort and swelling. Clean the wound thoroughly with soap and water. Seek medical attention if pain is severe, infection develops, or an allergic reaction (e.g., extensive swelling, difficulty breathing, dizziness) is suspected.
Safe Encounters and What to Do
When encountering a Giant Water Bug, avoid direct contact. Never pick them up with bare hands, as bites are most likely then. Staying calm is helpful, as panicking could provoke the insect.
If a Giant Water Bug is indoors, especially at night, turn off outdoor lights to encourage it to fly away. For removal, gently guide the insect with a broom or cardboard towards an exit. To prevent entry, reduce excessive outdoor lighting and ensure windows and doors have well-maintained screens. Sealing cracks and crevices also helps deter them.