The small, pale lizards you see clinging to your Florida porch light at night are almost certainly non-native house geckos. Florida is home to at least ten gecko species, but only one, the Florida reef gecko, is actually native to the state. The rest arrived through cargo shipments or the pet trade over the past century, and three species in particular have become the most common visitors to Florida homes.
Which Species You’re Likely Seeing
Three house gecko species dominate Florida’s residential areas, and telling them apart takes a little attention to detail.
The Mediterranean gecko was the first to establish itself, identified in Florida as early as 1910. It’s a small, bumpy-skinned gecko, typically pale pinkish or translucent white with scattered dark spots. Its skin has a warty texture from rows of raised bumps called tubercles. Adults reach about 4 to 5 inches long including the tail. You’ll most often spot them near exterior lights at night.
The tropical house gecko looks similar in size and habits but has smoother skin with a more mottled, grayish-brown pattern. It has become increasingly common across the state, particularly in central and south Florida, and is known for being more aggressive than the Mediterranean gecko in competing for territory.
The common house gecko (sometimes called the Asian house gecko) rounds out the trio. It’s slightly more uniform in color, often a tan or light gray, and is the species most widely distributed globally. All three are nocturnal, insect-eating, and drawn to the artificial lights on buildings.
How They Climb Walls and Make Noise
House geckos can walk straight up glass, stucco, and painted walls thanks to millions of microscopic hair-like structures on their toes called setae. Each seta branches into even tinier tips called spatulae, which make such close contact with a surface that electrons in the two materials interact, creating an attractive force. To release its foot for the next step, the gecko simply changes the angle of these structures, breaking the bond instantly.
Researchers at NIST discovered that setae are also coated in an ultra-thin, water-repelling lipid layer only one nanometer thick. This coating likely pushes moisture away from the contact point, helping geckos maintain grip even on wet surfaces. The setae themselves are made of keratin, the same protein in human hair and fingernails, with fibers aligned to resist abrasion from constant climbing.
If you’ve heard a rapid chirping or clicking sound from your walls or ceiling at night, that’s a house gecko vocalizing. Unlike most lizards, house geckos are notably vocal. Males use chirping calls to defend territory and attract mates. The common house gecko is especially loud, producing a distinctive “chuck-chuck-chuck” that carries surprisingly well indoors.
What They Eat and Why They Gather
House geckos are insectivores. Their diet consists of moths, mosquitoes, cockroaches, beetles, ants, spiders, and other small invertebrates drawn to nighttime lighting. A single gecko can eat dozens of insects per night, which is why many Florida homeowners consider them beneficial. Porch lights and illuminated windows create a buffet, concentrating both insects and the geckos that hunt them.
This relationship is the key to understanding gecko behavior around your home: where insects gather, geckos follow. A house with heavy insect activity, particularly near exterior lighting, will attract more geckos. Reducing outdoor lighting or switching to yellow “bug lights” that attract fewer insects can noticeably cut down on gecko traffic.
Impact on Native Wildlife
Florida’s only native gecko, the Florida reef gecko, is a tiny species found primarily in the Keys and parts of southeastern Florida. It’s considerably smaller than the house geckos and occupies a somewhat different niche, living in leaf litter, under bark, and in rock crevices rather than on building walls. However, the tropical house gecko in particular has been documented displacing other small reptiles through competition for food and shelter. As these non-native species spread, they add pressure to an ecosystem already strained by dozens of invasive reptile species.
That said, house geckos are firmly established in Florida and aren’t going anywhere. No eradication program exists for them, and their population is self-sustaining statewide.
Keeping Geckos Out of Your Home
Most house geckos stay outdoors, but they regularly slip inside through gaps around doors, windows, plumbing penetrations, and cracks in exterior walls. Once inside, they tend to hide behind furniture, in closets, or near bathrooms and kitchens where moisture and insects are present. They aren’t dangerous, don’t carry diseases of concern to humans, and won’t damage your home. But if you’d rather not share your living space with them, a few practical steps help.
Start by inspecting your home’s exterior for entry points. Seal gaps around doors and windows with weatherstripping or caulk. Fill larger openings around pipes and utility lines with copper mesh, which geckos can’t easily push past. Fix any plumbing leaks promptly, since geckos seek out warm, humid hiding spots, and standing moisture encourages breeding.
The most effective long-term strategy is reducing the insect population around your home. Geckos congregate where food is abundant, so fewer insects means fewer geckos. Keep exterior lights off when not needed, switch to insect-resistant bulb colors, and address any standing water that breeds mosquitoes. Indoors, reduce clutter like stacked boxes or newspapers that provide hiding spots.
If a gecko is already inside and you want it out, the simplest approach is to guide it toward an open door at night when it’s active. You can also place sticky traps (glue boards) along walls near entryways to capture geckos passively. If you use a glue trap and want to release the gecko alive, a small amount of vegetable oil applied to the glue will free it without injury.
Are House Geckos Worth Keeping Around?
Many Florida residents actively welcome house geckos on their property. A few geckos stationed near your porch light can put a real dent in the local mosquito and moth population without any effort on your part. They’re quiet during the day, harmless to people and pets, and their droppings (small dark pellets with a white tip) are easy to wash away. The main complaints are the droppings themselves, the occasional chirping at night, and the startle factor of finding one behind a picture frame. For most homeowners, the pest control benefits outweigh the nuisance, making coexistence the path of least resistance.