http://www.bigdawg-dir.com/Amphibians_and_Reptiles/Snakes/Black-headed_Cat_Snake/Pet and Animal Directory consisting of common animals and pets from around the world. Quality links and resources are contained inside the Big Dawg Pet and animal directory.Add your links today and help us grow to be the biggest on the web. The Gold-ringed Cat Snake or Mangrove Snake Boiga dendrophila is a species of snake that belongs to the genus of Boiga. The average size of an adult mangrove snake is about two and a half meters, or about eight feet. It is venomous, but its venom is mild and usually only causes humans some pain and discomfort.