The term 'Crumb Carriers' refers to ants, which are four-letter insects that are known for their ability to carry food crumbs back to their nests. Ants are social insects that live in colonies and work together to find food and build their nests. They have a strong sense of smell and can detect food from far away. They are also able to lift objects that are much larger than themselves, making them ideal for carrying crumbs.