Earwigs are often met with suspicion and fear, primarily due to their intimidating pincers and nocturnal habits. A common question that arises when dealing with these insects is whether they can drown just like other land-dwelling creatures. The short answer is yes, earwigs can absolutely drown, but their behavior and physiology make them remarkably resilient in environments where water is present.
The Physiology of Respiration
To understand why earwigs can drown, it is essential to look at how they breathe. Unlike fish, which use gills to extract oxygen from water, earwigs are terrestrial insects that rely on a tracheal system. This system consists of a network of tubes called tracheae that deliver oxygen directly to tissues through small openings on the sides of their body known as spiracles. While this system is efficient on land, it is not designed for extracting oxygen from water. When an earwig is submerged, water fills these spiracles, preventing air from reaching the tracheal system and effectively cutting off the oxygen supply.
Behavioral Avoidance of Water
Earwigs exhibit a strong behavioral aversion to water, which is a primary defense mechanism against drowning. They are nocturnal creatures that prefer to hide in cool, dark, and dry cracks and crevices during the day. You will rarely find an earwig in damp soil unless the environment is overly crowded or their habitat has become too dry. If you place an earwig in a glass of water, it will typically thrash around, trying to climb out. This frantic movement is a clear indicator that the insect is stressed and attempting to escape a life-threatening situation.
Trapping and Drowning Risks
- Slippery surfaces in bathtubs or sinks can prevent them from climbing out.
- They may fall into containers and be unable to escape due to smooth walls.
- Outdoor pests might drown in shallow pools of water after heavy rainfall.
- Moisture-wicking materials like towels left on the floor can trap them.
While they are capable of holding their breath for a period, the duration is limited. Eventually, water displacement leads to exhaustion and drowning. This is why they are often found dead in sinks or toilets, not because they climbed in seeking water, but because they accidentally fell in and could not escape.
Survival Tactics and Limitations
Earwigs possess certain survival instincts that allow them to endure damp conditions for a short time. They are capable of clinging to surfaces even when wet, and their flattened bodies allow them to squeeze into tight spaces where moisture is minimal. However, these adaptations are for avoiding heavy rain or humidity, not for living underwater. Prolonged exposure to moisture will lead to suffocation, just as it would for any other air-breathing insect. They do not have the biological adaptations to process water for oxygen, making them vulnerable in aquatic settings.
Common Misconceptions about Earwig "Drowning"
There is a persistent myth that earwigs crawl into human ears while people sleep and burrow into the brain. While this is biologically impossible, the myth sometimes conflates with the idea that they might "drown" in the ear canal. In reality, if an earwig were to enter an ear, it would likely be dislodged by natural jaw movements or expelled with water during washing. The concern about drowning in the ear is as fictional as the myth of them laying eggs in the brain. Understanding their actual biology helps dispel these unfounded fears.
Effective Methods for Control
Knowing that earwigs can drown is useful information when trying to control an infestation. Simple traps can be highly effective. For instance, placing rolled-up damp newspapers or cardboard tubes in the garden overnight provides a moist shelter that earwigs are attracted to. In the morning, you can dispose of the traps in a sealed bag or drown them in soapy water. Alternatively, creating a barrier of diatomaceous earth around the foundation of your home can deter them without the need for drowning, as the sharp particles damage their exoskeletons, causing dehydration.
Environmental Considerations
From an ecological standpoint, earwigs play a vital role in the environment by consuming decaying plant matter and controlling populations of smaller insects like aphids. While it is necessary to manage their numbers around the home, it is not necessary to eradicate them entirely. If you find earwigs drowning in a pool or sink, it is often a sign that they are searching for moisture due to a lack of humidity elsewhere. Addressing the root cause of moisture accumulation in your home is usually a more sustainable solution than relying solely on drowning them as a method of population control.
