Habitat :

In the wild, turquoise day geckos live exclusively on the (endangered) screwpine, Pandanus rabaiensis,[2] mostly in the leaf crown. They only live on large trees, those with leaves more than a meter long.[6] A single leaf crown will typically contain a single individual, or an adult male, and adult female, and juveniles.[6] They eat small insects and drink water from leaves. They are also fond of nectar.

Habitat loss :

Collectors commonly cut down screwpine trees to reach the geckos living in the leaf crest, destroying the gecko's habitat. Many geckos are thought to die while being shipped to market. The pet trade is likely a worse threat than habitat loss.[2]

L. williamsi's tropical forest habitat is also shrinking and fragmenting.[7] Neither of the Catchment Forest Reserves where it occurs is well-protected.[1] The forest is seriously threatened by pet collectors,[2] clearing for farmland, illegal logging, increasingly frequent fires,[1]mining of rubies, tourmaline, rhodolite, gold[6] and dolomite and limestone from outcrops on which the screwpines grow.[1] Invasive trees such as Cedrela are also a threat.[6] There is little forest left unaffected.[7]

Appearance :

Males are bright blue with heavy black throat stripes, visible preanal pores, and hemipenile bulges. The females range from brown or bronze to bright green, and have little to no black on their throat. Females can easily be confused with juvenile or socially suppressed males that are also green, sometimes with a bluish cast. The underside of both sexes is orange. Colours of individuals vary according to mood and temperature. Males may range from black or gray to brilliant electric blue. Females may range from dark brown to brilliant green with turquoise highlights. Adult snout-vent length is 5 to 8 cm (2.0 to 3.1 in).

An Lygodactylus spp. identification guide- PDF file  has been published online by CITES.,[8] largely for the use of customs officers (illegal shipments of these geckos are often intentionally mislabelled).[6]

Behavior :

Like all geckos of the genera Lygodactylus and Phelsuma, this species is diurnal. They are bold, active, and social. Males are territorial, and do not generally tolerate the presence of other males.[6] Social gestures include lateral flattening, puffing out of the throat patch, head shaking and head bobbing, and tail-wagging.

Reproduction :

Males court females with lateral flattening, puffing out of the throat pouch, and head bobbing. Two to three weeks after copulation, the female lays a clutch of 1 or 2 pea-sized white, hard-shelled eggs which are glued to a surface in a secure, hidden location. Eggs hatch in 60 to 90 days.

Etymology :

The specific name, williamsi, given to the gecko by British zoologist Arthur Loveridge,[9] honours American herpetologist Ernest Edward Williams.[10]