The back of the male has a bright blue colour and is covered with dark red spots and dashes.

It has been found that the blue-tailed gecko will change its foraging behavior from diurnal to nocturnal in situations in which it has artificial light sources at its disposal.

When artificial lights are used in nocturnal situations, it alters the amount of time and effort that visual predators will spend foraging.

This species is the sole pollinator and seed disperser of a climbing shrub, Roussea simplex, which is endemic to the mountains of Mauritius.

[citation needed] The blue-tailed day gecko inhabits the island Mauritius where it is widely distributed.

The flowers of the now critically endangered liana Roussea simplex produce copious amounts of nectar and are pollinated only by the blue-tailed day gecko.

The blue-tailed day gecko plays a role by licking up a gelatinous substance secreted by the fruit which contains the minute seeds.

Lizards that are active and forage in habitats that are open tend to increase the probability that they will be attacked by ambush predators.

[citation needed] The blue-tailed gecko frequently will hide amongst dense patches of palm-like Pandanus plants in order to protect itself from its enemies.

[10] This bird feeds almost exclusively on Phelsuma geckos, making P. cepediana one of its main prey items.

[11] The 2mm-long ant Technomyrmex albipes that was introduced to Mauritius from the Indo-Pacific area seals the flowers of Roussea with clay to protect mealy bugs.

The ants attack animals that visit the plant, preventing the blue-tailed day gecko from pollinating the flowers and eating from the fruit, and in this way seriously hampering Roussea's reproduction.