This page goes deeper than the surface Ribbon worms can be tiny or incredibly long. Most are only a few centimeters, but some species grow for dozens of meters. The bootlace worm is believed to reach up to 30 to 60 meters long, making it possibly the longest animal on Earth, even though it is only a few millimeters wide. What makes ribbon worms special is how they hunt. They have a hidden feeding tube called a proboscis stored inside their body. When prey comes close, they shoot it out in second