1.any of various small chiefly tropical and usually nocturnal insectivorous terrestrial lizards typically with immovable eyelids; completely harmless
GeckoGeck"o (gĕk"�), n.; pl. Geckoes (gĕk"ōz). [Cf. F. & G. gecko; -- so called from the sound which the animal utters.] (Zoöl.) Any lizard of the family Geckonidæ. The geckoes are small, carnivorous, mostly nocturnal animals with large eyes and vertical, elliptical pupils. Their toes are generally expanded, and furnished with adhesive disks, by which they can run over walls and ceilings. They are numerous in warm countries, and a few species are found in Europe and the United States. See Wall gecko, Fanfoot.
definition of Wikipedia
Abbott's Day Gecko • Adrian Gecko • Afghan leopard gecko • African fat-tailed gecko • Agalega Island Day Gecko • Agalega day gecko • Aldabra Day Gecko • Aldabra Island day gecko • Algerian Wall Gecko • Amaral's Brazilian Gecko • Andaman Islands day gecko • Angola dwarf gecko • Angulated dwarf gecko • Anjouan Island day gecko • Ashy gecko • Assumption Day Gecko • Assumption Island day gecko • Atlas Day Gecko • Auckland green gecko • Banded Toed Gecko • Barbour's day gecko • Barking Gecko Theatre Company • Beaked gecko • Bernard's dwarf gecko • Bibron's gecko • Black-eyed gecko • Blanc's dwarf gecko • Blue-tailed day gecko • Boehme's giant day gecko • Boettger's Wall Gecko • Bradfield's dwarf gecko • Broad-tailed Gecko • Broadley's dwarf gecko • Böhme's Gecko • Cape dwarf gecko • Cheke's day gecko • Chobe dwarf gecko • Christmas Island Gecko • Cloudy gecko • Cochran's Croaking Gecko • Common House Gecko • Day Gecko • Day gecko • Desert Wall Gecko • Dull day gecko • Duvaucel's gecko • Dwarf Bronze Gecko • Dwarf yellow-headed gecko • East Canary Gecko • European Leaf-toed Gecko • Flat-tailed House Gecko • Flat-tailed day gecko • Forest gecko • Four Spot Day Gecko • From the Gecko • Gargoyle gecko • Gecko (band) • Gecko (computer software) • Gecko (disambiguation) • Gecko (layout engine) • Gecko (software) • Gecko (theatre company) • Gecko Gear • Gecko Runtime Engine • Gecko Turner • Gecko catshark • Gecko engine • Gecko tape • Geico gecko • Giant Bronze Gecko • Gold dust day gecko • Gold-striped gecko • Golden Gecko • Gomero Wall Gecko • Gordon Gecko • Gran Canaria Gecko • Grand Comoro day gecko • Harlequin gecko • Hawequa Flat Gecko • Helmeted gecko • Henkel's Leaf-tailed Gecko • Henry's Amazing Golden Gecko Awards • Indo-Pacific Gecko • Iraqi eyelid gecko • Jammu bent-toed gecko • Jewelled gecko • King dwarf gecko • Koch's giant day gecko • Kuroiwa's Ground Gecko • La Digue Day Gecko • La Gomera Gecko • Leach's Giant Gecko • Leachs giant gecko • Leaf-toed gecko • Leopard gecko • Leschenault's Leaf-toed Gecko • Lewis Pass green gecko • Lined day gecko • Madagascar Gecko • Madagascar day gecko • Mahé Day Gecko • Mahé day gecko • Malayan Forest Gecko • Marlborough green gecko • Mauritius lowland forest day gecko • Mauritius ornate day gecko • Mauritius upland forest day gecko • Mediterranean house gecko • Methuen's Dwarf Gecko • Monito Gecko • Mossy New Caledonian Gecko • Muller's Velvet Gecko • Namaqua Day Gecko • Narrow-tailed Four-clawed Gecko • Nelson green gecko • New Caledonian Crested Gecko • New Caledonian Giant Gecko • New Caledonian bumpy gecko • Northland green gecko • Ocellated Day Gecko • Ocellated Gecko • Ocelot Gecko • Okavango dwarf gecko • Oriental Leaf-toed Gecko • Oudri's Fan-footed Gecko • Painted dwarf gecko • Paraguanan Ground Gecko • Pasteur's day gecko • Pasteur's dwarf gecko • Pemba Island day gecko • Peringueyi's Leaf-toed Gecko • Persian Spider Gecko • Qattara Gecko • Reef Gecko • Reticulated Gecko • Robert Mertens' day gecko • Rodrigues Giant Day Gecko • Rodrigues day gecko • Rough Snouted Giant Gecko • Rough gecko • Rough-snouted giant gecko • Rough-tailed Gecko • Round Island day gecko • Réunion Island day gecko • Réunion Island ornate day gecko • Sago Gecko • Sarasin's giant gecko • Sarasins giant gecko • Scarce Ground Gecko • Seipp's day gecko • Serpent Island Gecko • Seychelles Bronze Gecko • Seychelles Giant Day Gecko • Seychelles Sucker-tailed Gecko • Seychelles giant day gecko • Seychelles small day gecko • Short Snouted New Caledonian Gecko • Short-Snouted New Caledonian Gecko • Skunk gecko • Small-scaled Leaf-toed Gecko • South-West Spiny-tailed Gecko • Southern Leaf-tailed Gecko • Speckled day gecko • Spotted Day Gecko • Standing's day gecko • Stephen's Island gecko • Stripeless Day Gecko • Switak's Banded gecko • Takitimu gecko • Tenerife Gecko • Tenerife Wall Gecko • Texas Banded Gecko • Tokay gecko • Tree Dtella Gecko • Tropical house gecko • Turkmenistan Eyelid Gecko • Viper gecko • Wellington green gecko • West Coast green gecko • Western dwarf gecko • White line gecko • White-headed dwarf gecko • White-line gecko • Xantus Leaf-toed Gecko • Yellow-headed day gecko • Yellow-headed dwarf gecko • Yellow-throated day gecko • Zaire dwarf gecko
animal servant de référence, de signe (fr)[ClasseParExt.]
Temporal range: 50 Ma - Recent, putatively as early as 110 Ma
|Gold dust day gecko (also known as Madagascar day geckos)|
Geckos are unique among lizards in their vocalizations, making chirping sounds in social interactions with other geckos. Geckos are the second most species rich group of lizards (after skinks), with close to 1,500 different species worldwide and many others likely yet to be discovered. The New Latin gekko and English gecko stem from the Malay gēkoq, which is imitative of the sound the animals make.
All geckos, excluding the Eublepharidae family, have no eyelids and instead have a transparent membrane which they lick to clean. Many species will, in defense, expel a foul-smelling material and feces onto their aggressors. There are also many species that will drop their tails in defense, a process called autotomy. Many species are well known for their specialized toe pads that enable them to climb smooth and vertical surfaces, and even cross indoor ceilings with ease (one hypothesis explains the ability in terms of the van der Waals force). These antics are well-known to people who live in warm regions of the world, where several species of geckos make their home inside human habitations. These species (for example the House Gecko) become part of the indoor menagerie and are often welcome guests, as they feed on insects, including mosquitoes. Unlike most lizards, geckos are usually nocturnal and are great climbers.
The largest species, the Kawekaweau, is only known from a single, stuffed specimen found in the basement of a museum in Marseille, France, and one documented sighting in the wild in 1870. This gecko was 60 cm (24 in) long and it was endemic to New Zealand, where it lived in native forests. It was probably wiped out along with much of the native fauna of these islands in the late 19th century, when new invasive species such as rats and stoats were introduced to the country during European colonization. The smallest gecko, the Jaragua Sphaero, is a mere 1.6 cm long and was discovered in 2001 on a small island off the coast of the Dominican Republic.
Geckos come in various patterns and colors such as purple, pink, blue, and black, and are among the most colorful lizards in the world.
Some are subtly patterned and somewhat rubbery looking, while others are brightly colored. Some species can change color to blend in with their environment or with particular temperatures. Some species are parthenogenic, which means the female is capable of reproducing without copulating with a male. This improves the gecko's ability to spread to new islands. However, in a situation where a single female gecko populates an entire island, the island will suffer from a lack of genetic variation within the geckos that inhabit it. The gecko's mating call sounds like a shortened bird chirping which attracts males, when they are around. This allows a female to reproduce with more genetic variation, by using sexual reproduction instead of asexual.
The toes of the gecko have a special adaptation that allows them to adhere to most surfaces without the use of liquids or surface tension. The spatulae tipped setae on gecko footpads facilitate attractive forces called van der Waals forces to arise between the β-keratin lamellae/setae/spatulae structures and the surface.
These van der Waals interactions involve no fluids; in theory, a boot made of synthetic setae would adhere as easily to the surface of the International Space Station as it would to a living room wall, although adhesion varies with humidity. The setae on the feet of geckos are also self cleaning and will usually remove any clogging dirt within a few steps. Teflon, which has very low van der Waals forces, is more difficult for geckos to adhere to than many other surfaces.
Geckos' toes seem to be "double jointed", but this is a misnomer. Their toes actually bend in the opposite direction from human fingers and toes. This allows them to overcome the van der Waals force by peeling their toes off surfaces from the tips inward. In essence, this peeling action alters the angle of incidence between millions of individual setae and the surface, reducing the Van der Waals force. Geckos' toes operate well below their full attractive capabilities for most of the time. This is because there is a great margin for error depending upon the roughness of the surface, and therefore the number of setae in contact with that surface.
Use of small van der Waals attraction force requires very large surface areas: every square millimeter of a gecko's footpad contains about 14,000 hair-like setae. Each seta has a diameter of 5 micrometers. Human hair varies from 18 to 180 micrometers, so a human hair could hold between 3 and 36 setae. Each seta is in turn tipped with between 100 and 1,000 spatulae. Each spatula is 0.2 micrometer long (one five-millionth of a meter), or just below the wavelength of visible light.
If a typical mature 70 g (2.5 oz) gecko had every one of its setae in contact with a surface, it would be capable of holding aloft a weight of 133 kg (290 lb): each spatula can exert an adhesive force of 10 nanonewtons (0.0010 mgf). Each seta can resist 10 milligrams-force (100 µN), which is equivalent to 10 atmospheres of pull.
Recent studies have also revealed that apart from the setae, phospholipids - fatty substances produced naturally in their body - also come into play. These lipids lubricate the setae and allow the gecko to detach its foot before the next step.
|Wikimedia Commons has media related to: Gekkonidae|
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