Dendrelaphis calligastra, the northern tree snake (also called beautiful-bellied tree snake) is a slender, large-eyed, nonvenomous, diurnal snake. It grows up to 1.2 m in length and is greenish, brown, or greyish above with a cream or yellow belly. This common snake is harmless, and readily recognised due to its cream to yellow belly and pronounced wide dark facial stripe passing across the eye.