with trends observed in other tropical, subtropical and temperate species of gecko. Thermal independence exists between 26–35 degrees, with some capacity to self regulate temperature. This means that where the environmental temperature is 26–35 degrees, the common house gecko can modify body temperature through behavioural adaptations. Breathing rates of geckos are temperature dependent above this maximal heat, but independent as it grows colder. There are behavioural mechanisms of thermoregulation present, such as the selection of sunlight and the substrates on which they sit. The common house gecko can be best defined as quinodiurnal. This means they thermoregulate during the daytime and forage at night. An active form of this thermoregulation includes the presence of the gecko in lighter environments, proximal to cracks in the substrate. As such, there is a close relationship between activity levels and correlated air temperature. Timing of the circadian rhythm of the common house gecko is further impacted by light levels. This rhythm tends to involve the highest population presence around midnight, with highest activity levels just after sunset, with a gradual reduction until dawn. Daily cycle differences from place to place can generally be explained by environmental factors such as human interaction, and structural features. A peak in hunting activity after dark places them in an ideal spot to take advantage of invertebrate congregation around artificial lighting in the urban environment. Due to this level of dependence on the environment, drops in temperature may act as a leading indicator for reduced gecko sightings in the medium term. Acute weather events such as rain or wind will result in acute decreases in Gecko sightings within that environment. It is unsure what impact these phenomena may have on the long term on distribution and the capacity of the common house gecko to compete with other gecko species. There is some weak evidence to suggest a trend towards higher temperature for females, which has an evolutionary advantage of increasing the speed of egg development. However, there is no statistically significant data to support this. Due to them being a species which is adapted for tropical or subtropical environments, there appear to be few physiological adaptations designed to prevent water loss. This may limit their capacity to thrive in arid or semi-arid environments. Reproductive biology H. frenatus has a similar gonad structure to the remainder of the gecko family. It is possible to differentiate the sex of larger common