(CNN) — For nearly two centuries, scientists have tried to solve an enduring mystery about a giant millipede-like animal named Arthropleura that used its many legs to roam Earth more than 300 ...
They can grow about ½ inch long, while centipedes are long and slender, growing up to 12 inches. While centipedes prefer damp areas and feed on insects and other small animals, firebrats are usually ...