The RIBBON WORMS are the simplest animals to possess a circulatory
system and a gut with a separate mouth and anus. The body is usually
long and slender and is often extended greatly during movement. Most
species are less than 20 cm (8 inches) long, but the giant species may reach a length of 30 m (100 feet).
RIBBON WORM |
FACT:Some Ribbon Worms eat themselves when they don't find food.