Amerafrican House Gecko

Highly adaptable and small-to-medium-sized, this nocturnal squamate reptile features a snout-vent length ranging between 50 and 68 millimeters, with a maximum total length of approximately 12.5 centimeters. Its body is somewhat dorsoventrally flattened, allowing it to wedge easily into narrow crevices. The dorsal coloration is highly variable and dynamic, shifting from a translucent pale gray or white under the cover of darkness to a dark brownish-gray with prominent V-shaped bands during daylight hours, a physiological response triggered by light intensity and temperature. Its skin is covered in small, granular scales interspersed with prominent keeled tubercles. The large, lidless eyes possess vertical, slit-like pupils optimized for low-light vision, which the lizard cleans using its long, fleshy tongue. Its expanded toes are equipped with divided subdigital lamellae that generate Van der Waals forces, granting the species the remarkable ability to scale smooth, vertical surfaces with ease.

Geographical distribution: Native to Sub-Saharan Africa, this taxon has successfully expanded its geographical range across the globe. Today, established populations are found throughout South America, the Caribbean islands, Central America, and southern North America, particularly within the state of Florida. This transoceanic dispersion was historically facilitated by the slave trade and has been continuously augmented in modern times by the international trade of cargo and ornamental plants, solidifying its status as one of the most widespread invasive reptiles globally.

Habitat: Demonstrates a strong synanthropic nature, thriving extensively within urban and suburban environments. It is commonly observed on residential walls, light fixtures, ceilings, and inside human dwellings. Beyond urban centers, it also populates disturbed forest edges, agricultural fields, rocky outcrops, and hollow tree trunks in both its native and introduced ranges. Its plastic ecological tolerance allows it to withstand various microclimates, benefiting from the heat island effect produced by concrete structures for active thermoregulation.

Feeding: Operates as an opportunistic, nocturnal predator with a generalist diet composed mainly of insects and other small invertebrates. Its prey includes moths, beetles, mosquitoes, spiders, termites, and roaches. It frequently aggregates near artificial light sources to ambush insects attracted to the illumination. Intraspecific and interspecific predation have been documented, with adults occasionally consuming smaller juveniles of their own species or competing native geckos, disrupting native food webs.

Behavior: Primarily nocturnal and crepuscular, it spends the daylight hours concealed within wall cracks, behind picture frames, or under tree bark. It displays strong territoriality, and dominant males actively defend foraging sites using distinct, acoustic vocalizations characterized by a series of rapid clicking sounds. To evade predators, it utilizes caudal autotomy, self-amputating its tail, which later regenerates as a cartilaginous structure with modified scaling.

Reproduction: Characterized by an oviparous reproductive strategy that occurs year-round in warm, tropical zones. Females mature within their first year and produce multiple clutches annually, each consisting of two hard-shelled, spherical eggs. These eggs are deposited in secure, concealed microhabitats such as electrical boxes or crevices, often resulting in communal nesting sites. The incubation period spans from 20 to 80 days, highly regulated by ambient temperatures, which also play a key role in the sex ratio of the hatchlings.

Conservation status: Not globally threatened, this species is typically classified as Least Concern (LC) on regional red lists, and its global populations are steadily increasing. Its invasive nature makes it a subject of ecological concern, as it often outcompetes and displaces endemic lizard species in its introduced range, making active management sometimes necessary in sensitive habitats.