Jellyfish are a particularly weird species, and they are a very successful species, but they lack many things that complex and more successful animals have. Like a central nervous system or digestive tracts! How weird is that defenders? You are probably asking yourselves “Well, how do they eat or digest food?”. If you remember from the "What are Nematocytes?" tile of the Kids' Zone, jellyfish use these awesome harpoons to grab their prey and hold on to them long enough to start devouring them. The food they catch goes into a digestive cavity or gastrovascular cavity, which is located dead center of the jellyfish. This operates like a giant digestive bag and its connected directly to nutrient absorption. Once the jellyfish has digested all of the meal it caught, all the waste is removed from the same cavity opening.