Are they poisonous or have stingers that are poisonous?

Yes. (Why would you want to eat one anyway,that would be weird.)

There are many, many different species of butterfly, so in order to provide some kind of answer let's consider only the Monarch butterfly. Monarchs feed on milkweed, which contains a compound that is...

Snakes do not have poison, they have venom. Some venomous snakes are taipans, Gaboon vipers, Mangshan vipers, Eyelash crested vipers, and Sawscaled vipers. Those are the coolest in my opinion.

Presuming you are talking about Nelumbo species, then all parts are edible either raw or cooked. Although for any real nutrition, eat the roots after boiling them. There is no point in eating the...