How are pit vipers unusual?

Answer:
They are poisonous. Injecting the venom, hemotoxin, as opposed to cobras, which inject neurotoxin. An example of a pit viper is a rattlesnake.
First answer by MiamiBoy46. Last edit by MiamiBoy46. Contributor trust: 26 [recommend contributor recommended]. Question popularity: 1 [recommend question].