Derek wrote about the viper snake. Some key points are: - Vipers shouldn't be kept as pets as they can be dangerous if they bite, causing significant blood loss. - They are found mostly in Europe and eat small animals like rodents, frogs and insects. - Baby vipers are very small, around 10-15cm, when they are born and stay with their mother for a while. - Vipers come in different colors and the mother holds the eggs in her mouth until they hatch.