Etymologist Piotr Naskrecki studies katydids. A few years ago while studying in Guyana, Naskrecki heard a sound of heavy feet rustling nearby. As he investigated, he first thought he saw a big, hairy rodent. But it was something a lot creepier.
The South American Goliath birdeater, also known as the largest spider in the world.
Each of their eight arms can span up to nearly a foot in length, usually making them about the size of a puppy.
Their feet feature hard tips and claws that create a clicking sound while they walk around the forest.
Though their venom isn't fatal to humans, their sharp fangs are able to crush the head of a mouse with ease and should be avoided.