Easy. A fugu fish will kill you if you bite it, and a mapepire will kill you if it bites you.
There’s a difference between poison and venom that few people pay any mind to. You hear that someone was “bitten by a poisonous spider”. There was even one unfortunate newscaster who announced that someone was “stung by a poisonous snake”. (A new species, I presume.)
Remember: poison is ingested, (or inhaled, or even soaks through the skin). But most of the time, you have to eat it for it to affect you. Some creatures have evolved a toxin that dissuades predators from eating them, like the poison dart frog. There are also poisonous mushrooms (not to be confused with ‘shrooms that could make you very, very happy).
Venom is produced by some creatures, like spiders, snakes and wasps, as a weapon. They can inject it into your system using their stinger or fangs. Venom probably isn’t something you’re likely to eat.
Got it? And next time you venture outdoors, beware of those stinging snakes!