Anomalocaris is considered Earth's first Apex Predator. They lived in the Cambrian period, when the first animals were born. They are not very famous, but they appear in "Walking With Monsters," a BBC documentary about life before dinosaurs. Read the sub-pages to learn more about these disgustingly beautiful things. KEEP IN MIND: There is not much information we know for sure, as this thing is really old, and we only have its exoskeleton!