Day geckos of the genus Phelsuma (Gekkonidae) were observed at different localities in Madagascar. New distribution records are reported for Phelsuma laticauda laticauda in Maroantsetra (north-east coast), for Phelsuma hoeschi at Anosibe An‘Ala (central east) and for Phelsuma berghofi in Nosy Omby (south-east coast). In several populations highly malformed individuals were encountered; the causes for these malformations remain largely unclear. Furthermore some behavioral observations on a rival fight between two males of Phelsuma lineata lineata and a case of predation of Phelsuma laticauda laticauda on a juvenile Hemidactylus sp. are reported.