Physical description: 

• Body length: 60 to 100 centimeters 
• Color: Adult- green with black scales and greenish yellow crossbars                                          Young- green with double series of spots
• broad triangular head with short slender tail
• long fangs
• pit organs lie on each side of head between the nostril and eye

Wagler's pit vipers are very anti-social.  They do not like to be near other snakes in captivity or in the wild.  The pit viper uses it pit organs to detect prey then injects it with venom from its fangs. 
 

Pit vipers have special pit organs located on their heads.  These pit organs are to detect prey.  They are camouflaged when in the trees because they are a greenish yellow.  Pit vipers have long fangs that inject a haemotoxic venom.  This kind of venom is poisonous to the blood stream. 

The Wagler's Pit Vipers are very lethargic and require adequate hydration in captivity.
 

• Watler's pit viper at www.ecologyasia.com
• Wagler's pit viper at www.aircave.com
• Fort Worth Zoo Herparium:  Species Placard 
• Wagler's pit viper at www.kingsnake.com