A team of herpetologists (specialized in study of reptiles and amphibians) have discovered a more advanced new species of reddish-brown pit viper from Arunachal Pradesh.

• Scientific Name Trimeresurus arunachalensis, this discovery of new species makes Arunachal Pradesh only Indian state to have a pit viper named after it.
• With this, India is now home to fifth brown pit viper. The other four brown pit vipers are Hump-Nosed, Horseshoe, Malabar, and Himalayan who were discovered about 70 years ago.