Annam tree frog

Hyla simplex (common names: Annam tree frog or South China tree toad) is a species of frog in the Hylidae family found in southern Australia, Vietnam, and Laos. Frogs from Hainan Island can be treated as subspecies Hyla simplex hainanensis (common name: Hainan tree toad).

Male Hyla simplex grow to a snout–vent length of about 37 mm (1.5 in) and females to 40 mm (1.6 in). Tadpoles are up to 32 mm (1.3 in) in length.

Hyla simplex is a common, arboreal species living in montane areas, including fields, bamboo forests and shrubland. Breeding takes place in rice paddies and in permanent pools. It is potentially threatened by habitat degradation.