This small sea creature carries a potent venom that it uses to paralyze and capture its prey.
Also known as "killer bees," these bees are more aggressive than other bee species.
Although not directly deadly through physical strength or venom, mosquitoes are deadly because of their ability to transmit diseases such as malaria, dengue fever, Zika virus, West Nile virus, and yellow fever.
While not aggressive or venomous in the traditional sense, the pufferfish contains tetrodotoxin, a substance that is toxic to humans.
These vibrant-colored frogs are found in Central and South America. Their skin secretes a powerful toxin that can be lethal.
Small but deadly, the blue-ringed octopus carries enough venom to kill 26 adult humans within minutes.
Despite its almost transparent appearance and small size, the box jellyfish is considered one of the most venomous marine animals in the world.