It lives on the island Praslin in the Seychelles and typically inhabits trees and dwellings.

The Seychelles giant day gecko feeds on insects and nectar.

On the back there are irregularly shaped reddish dots and bars present.

This species is found on the island Praslin and Curieuse in the Seychelles Phelsuma sundbergi sundbergii is often found on different large trees such coconut palms, sea grape and coco-de-mer palms (Lodoicea maldivica).

In captivity, these animals can be fed with crickets, wax moth larvae, fruit flies, mealworms and houseflies.