Sri Lankan pit viper

Description

Trimeresurus trigonocephalus is a sexually dimorphic,mid-sized,cylindrical species.These snakes measure 20–25 cm (7.9–9.8 in) at birth,and males grow to a maximum total length of 60–75 cm (24–30 in).The neck is distinct from the flattened,triangular head.There is a loreal pit on each side of the head.Mid-sized eyes and a short,rounded,broad snout are present.The males are considerably smaller than females,which can grow up to 130 cm (51 in) in total length.The ground color of the snake is variable and cryptic.Typically,it is a green snake with a black variegated pattern,and a black temporal line is usually present.The wet zone snakes have these black patterns more clearly marked.The vertebral area has a tinge of yellow.The tail is black.The ventral scales are light greenish-yellow or may even be grey.Some snakes have only the black temporal line and the black tail,with the rest of the body being green.In addition,males tend to have a blue coloration,whereas the females are predominantly green.These are bulky snakes with prehensile,short tails,suiting their arboreal lifestyle