▁genus ▁of ▁medium ▁to ▁large ▁ge ck os ▁of ▁the ▁family ▁Di pl od act yl idae . ▁ ▁All ▁species ▁in ▁this ▁genus ▁are ▁found ▁on ▁the ▁islands ▁that ▁make ▁up ▁New ▁C aled onia . ▁ ▁Gen us ▁characteristics ▁include ▁long ▁lim bs ▁and ▁to es ▁with ▁well - develop ed ▁l am ella e . ▁Some ▁we bb ing ▁occurs ▁on ▁the ▁h ind ▁lim bs ▁and ▁to es . ▁ ▁Rh ac od act yl us ▁possess ▁pre hens ile ▁t ails ▁which ▁also ▁have ▁l am ella e ▁to ▁assist ▁in ▁clim bing . ▁ ▁These ▁are ▁for ▁the ▁most ▁part ▁ar b ore al ▁ge ck os . ▁ ▁Rh ac od act yl us ▁are ▁no ct urn al ▁ge ck os . ▁ ▁The ▁species ▁are ▁egg ▁layers ▁with ▁the ▁exception ▁of ▁Rh ac od act yl us ▁tra ch yr h yn chus ▁and ▁R . ▁tra chy ce phal us ▁which ▁gives ▁live ▁birth , ▁a ▁characteristic ▁only ▁otherwise ▁found ▁in ▁New ▁Zealand ▁ge ck os . ▁They ▁also ▁feed ▁on ▁l iz ards , ▁more ▁so ▁than ▁any ▁of ▁the ▁family . ▁Rh ac od act yl us ▁ge ck os ▁are ▁sex ually ▁dim orph ic , ▁with ▁the ▁males ▁possess ing ▁larger ▁pre anal ▁por es ▁than ▁the ▁females ▁as ▁well ▁as ▁a ▁distinct ▁hem ip enis ▁pocket . ▁ ▁M ales ▁tend ▁to ▁be ▁stock ier ▁than ▁females ▁with ▁the ▁exception ▁of ▁R . ▁aur icul atus ▁in ▁which