Which animal is the only poisonous mammal in the world?

The only poisonous mammal in the world is the Platypus (Ornithorhynchus anatinus). The male platypus has a spur on each hind foot that is connected to a venom gland. The venom is used to ward off predators and can cause severe pain in humans. The venom contains a variety of compounds, including sodium, potassium, and calcium channel blockers, as well as an array of proteins and peptides. The venom is not lethal, but can cause intense pain and swelling in humans. The venom can be released when the platypus feels threatened, and it is usually released through the spurs on its hind feet. The platypus is the only mammal in the world that produces venom, making it the only poisonous mammal in the world.