sri lankan green pit viper, trimeresurus trigonocephalus, sinharaja national park rain forest

animal area asia asper biodiversity biology biosphere biotope conservation dangerous ecology ecosystem ecotourism environment fauna forest free green habitat heritage history jungle lanka lankan national natural nature park pit portrait rain rainforest reptile reserve sanctuary sinharaja site snake sri trigonocephalus trimeresurus tropical unesco venom venomous vertebrate viper wild wildanimal wilderness wildland wildlife world zoology