Do any other animals have the same poisons as box jellyfish?

Box jellyfish are unique in their possession of a specific group of toxins known as box jellyfish toxins (BJT), which are proteins responsible for the venom’s deadly effects. These toxins target various ion channels in the human body, primarily affecting the nervous system and heart, leading to severe symptoms and potentially fatal outcomes. Some other types of jellyfish, such as Irukandji jellyfish and Chironex yamaguchii, also possess similar but distinct toxins. However, no other animals have been found to possess the same toxins or venom properties as box jellyfish.