The adder will attack only if it feels threatened, as can happen if you take it by surprise and step on it accidentally, or if you try to catch it or pick it up, which it dislikes intensely.

• 蝰蛇只有在受到惊吓时才发动攻击，也就是当人们偶然给它以惊吓、偶然踩在它身上、企图把它抓住或把它捡起来时(它们很不喜欢这样)，它才咬人。