工地上老师傅说以前见过一条4、5米长。头长有2个冠的蛇，红色的像猪耳朵那样立起来。这是什么蛇啊。
推荐回答（3个）
鸡冠蛇，头如雄鸡有冠。身长尺余，围可数寸，中人必死。会稽山下有之。（摘自《录异记》）
它头长火红鸡冠，体色各异，异常迅猛，其毒无比，可直立上身，发出怪声，叫声如母鸡“咯咯咯”，会腾空飞行，长一米多。是一种无脚且头顶带红冠的蛇。一般百姓人为，鸡冠蛇是成精了，不能打，谁打它，谁就会碰到霉运。
据说有些会主动攻击人，有些则不会.攻击时鸡冠状物便由红变紫。一旦人惹它之后它就会跳起来比人高，没它高就死定了，如果你比它高它自己就会逃，不会伤人。千万不要跑直线要拐着弯跑。
听过它会喷毒雾 许多人误以为是烟 传说它的毒无解. 知道“鸡冠蛇”习性的朋友自然不会卤莽捉蛇，唯恐躲避不及的。
相传智斗“鸡公蛇”的本领：
据说这种蛇要和人争高低。如果比它高，它就不敢来追。对付它的办法就是赶快脱下一只鞋往空中一抛，蛇看风了就会赶紧掉头而去。
确实有不少蜥蜴和蛇类都有“鸡冠蛇”这个外号,但不可能看到的人都把蜥蜴当作蛇，而且蜥蜴是无毒的。
此蛇出现地点遍及中国大江南北的森林、目的等等，其中包括了 安徽黄山境内的大山中 大坪水库(东南近邻武当山，南面与神农架相连)、怀柔区渤海镇卧佛山地、湖北妫安县、辽宁凤城、吉林通化、四川、湖北广水乌龟山、胶东等等。
鸡冠蛇，或称“野鸡脖子”，其实为虎斑颈槽蛇的俗称，这是一种弱毒蛇，颈上赤红若火，头后长有毒腺状若冠，受威胁的时候会树立起前半身，从颈上的毒腺向人喷射毒液，很能吓唬人，所以被传为危险的蛇类，但是其实毒性不大，非过敏性体质的人一般没有危险的，但是因为在日本有过杀死人的案例，所以大家接触的时候还是小心为好
虎斑颈槽蛇由于颈上毒腺的原因，一般的蛇类都不敢冒犯它（有蝮蛇捕食鸡冠蛇自己反倒被毒死的案例），这也以其“蛇王”的传言相符
另外有些传言中的鸡冠蛇长有小脚，而虎斑颈槽蛇确实也发现过因返祖现象长有小脚的个体，综上原因，可以认定虎斑颈槽蛇就是传言中的鸡冠蛇
可能是一条眼镜王蛇，但是头上长冠估计是太夸张了，有时人们总是相信不可能的事，但是蛇没有冠也不是红色又非要给它加上一些色彩，这就是大多数人的习惯。
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