While individual mosquito bites are not deadly, mosquitoes are vectors for diseases such as malaria, dengue fever, and Zika virus, which can be fatal in some cases.
Found in the waters of the Pacific and Indian Oceans, the box jellyfish is considered one of the most venomous creatures in the world. Its sting can cause heart failure and death.
The small and colorful blue-ringed octopus carries venom that contains tetrodotoxin, a potent neurotoxin. There is no antivenom, and a bite can lead to respiratory failure and death.
Native to the rainforests of South America, the bullet ant has one of the most painful insect stings. While not lethal, the intensity of the pain has earned it the title of the "world's most painful insect sting."
The stonefish is a venomous fish found in the Indo-Pacific region. Its dorsal spines can inject potent venom that may lead to shock or, in extreme cases, death if not treated promptly.
Cone snails are marine snails that inject venom through a harpoon-like tooth. Some species produce toxins that can cause paralysis and respiratory failure in humans.
These brightly colored frogs, found in Central and South America, secrete toxins through their skin. The toxins can cause paralysis or even death if ingested or if they come into contact with broken skin.
Found in the Americas, kissing bugs can transmit a parasite called Trypanosoma cruzi, which causes Chagas disease. While not an immediate threat, Chagas disease can lead to serious heart and digestive issues.