During the middle of the Cambrian era, about 500 million years ago, the Hallucigenia existed. These now extinct animals were bizarre, and even though they were tiny – only 2 cm long – they were absolutely frightening. They had enormous spines and claw-like appendages, with a strange face that was only recently discovered.
Interestingly enough, Dr. Martin Smith, from the University of Cambridge, said: “It looks completely surreal. It is like something from another world.” They more closely resembled a caterpillar, because of its strange appendages, which were shown in the fossils, which were used as food-scavenging tentacles. It was believed they walked the earth on stilted legs. These frightening creatures aren’t ones we would’ve wanted to accidentally find outside or near our home! (Earth)