Border beaked gecko
The border beaked gecko is a gecko endemic to Australia in the family Gekkonidae. It is known for its distinctive beak-like snout and ability to camouflage itself in its surroundings.
Description
The border beak gecko is small with a long, slender body and short, pointed, beak-like snout. It grows to up to 95 millimeters in length. It has large protuberant eyes that provide almost all-around vision with reddish-brown with darker mottling above and numerous whitish or yellow spots along the back, sides and original tail. The head is paler with greyish mottling and obscure pal streak from the front of the eye to the rear of mouth, and white upper eyelid. Underparts are white, and feet have narrow, tapering digits. They have simple clawed feet with padded toes. Beneath the pads are rows of broad plate-like scales, each covered by thousands of microscopic bristles with branched, flattened tips. These structures, called setae, provide an enormous surface contact area, and are believed to adhere to the molecular level. It is distinguished from most other members of the genus by the combinations of two pre-anal pores; a single cloacal spur on each side; chin with a cluster of give enlarged scales, mental, first infralabial and postmental scales; a strong rostral groove; and distribution.Taxonomy
The genus was traditionally regarded as monotypic, with the single species of Rhynchoedura ornata named by Albert Gunther in 1867. In 2011 an extensive revision sampling of the population across Australia found overlooked genetic diversity in the genus and named four new cryptic species by Pepper, Doughty, Hutchinson and Keogh. Each species is native to a specific perennial river drainage, and active rivers during wet periods of the Neogene could have led to allopatric speciation within the genus.Distribution and habitat
Terrestrial geckos are mostly found on dry open terrain. They occur in arid to semi-arid regions of central inland eastern Australia, from the Eyre Peninsula, SA, through the Lake Eyre basin to south-eastern NT and south-western QLD. They are nocturnal and shelter in small, disused burrows, soil cracks, and under-leaf litter during the day. They are most abundant in open and recently burned areas.Ecology
Like many desert-dwelling species, the Border beaked gecko has adapted to the harsh conditions of its environment. It can survive without water, obtaining moisture from its food instead. In addition, their unique physical characteristics, such as their flattened bodies and sticky toes, allow them to move through rocky terrain quickly. The diet of the border beaked gecko consists primarily of termites, but they are also known to consume spiders and other small invertebrates at night.Being nocturnal, geckos usually indirectly source their heat, emerging from their retreats at dusk to forage on the sun-warmed substrate or in environments with suitable ambient temperatures. They are subjected to lower and more uniform ambient temperatures than the thermal mosaic of sun and shade available to diurnal lizards. A study of Western Australian desert geckos showed that body temperatures of active lizards are usually slightly higher than the air temperature, with arboreal geckos tracking them most closely. Smaller gekkonid and diplodactylid species were found at most elevated temperatures.
Border beaked geckos are preyed upon by a range of larger animals, such as snakes, birds, and small mammals. Camouflage is an effective means of avoiding predators. They become almost invisible, which superbly replicates the backgrounds they rest on, and mimic the stones around them.
The tail autonomy of the border beaked gecko means it can discard a disposable body part to escape. They have a specific fracture plane, the soft tissue in the centres of the caudal vertebrae. When grasped by the tail, it can be released at pre-weakened cleavage points. It can control how much tail they lose. This is efficient, as replacing a whole tail can be metabolically expensive, taxing a portion of food taken and potentially delaying reproductive success.
They have clear spectacles covering their lidless eyes and use their broad flat tongues to keep them clean. The Jacobson's organ is a chromogenic chamber opening into the roof of the mouth, detecting odorant particles delivered by the tongue, and conveying sensory information to the brain via the olfactory nerve. They can vocalize, but squeaks and chirrups are primarily used in moments of high stress – including social conflict, mating or attack by predators. When harassed, diplodactylid geckos rear and inflate their bodies.