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the pitohui is the only bird that is venomous. the venom is in his mouth and feathers.
the animal most poisonous in the world is the dart gold frog. this frog have a thumb size. he produce his own poison, but like he eat venomous insects. the insect's venom mix with his venom, making a big poison cocktail. and this delicious cocktail is wasted for the skin.
the worst toxin is the botulism. paralize the body until arrive to the heart, stopping it. some animals have this toxin. but the tin's have it too. well... just the stricken's one. that's why you have to throw out this tins.