Black Widows are very aggressive. The poison is extremely toxic, second only ( in the USA) to the Brown Recluse. Copperheads are actually a very retiring animal. Aquaintances in their range say it takes extreme, repeated aggression just to elicit a bite. More people die annually from various insect and spider bites than poisons from venomous snakes,The Gila Monster ( anyone who can get bit by a Gila needs serious counseling) or the various amphibians with poisonous skin glands. Improper treatment will exasperate an allready serious situation as will non treatment. The bottom line is to get the victim to proper treatment ASAP.