Pufferfish, also called blowfish, are highly poisonous due to tetrodotoxin, making them one lethal delicacy in Japan.
Striated surgeonfish, herbivores that eat toxic dinoflagellates, rank second among the world's most poisonous animals.
Beware of the small but deadly newts, which rank third among the world's most poisonous animals.
Comb stars, widespread in the Indo-Pacific, use tetrodotoxin and regenerate limbs, but lack brains and blood.
Spanish flies are actually beetles known for cantharidin toxin, causing blisters and historically used as an aphrodisiac.
Poison dart frogs, colorful and poisonous, accumulate toxins from their diet, but face endangerment due to deforestation.
Cane toads, terrestrial but ironically marine, produce bufotoxins, making them highly poisonous.
Hawksbill sea turtles, critically endangered, absorb toxins from jellyfish and sponges, making them poisonous but unharmed.