Genus Malacosoma is a group of insects commonly known as tent caterpillars or bagworms. Other synonyms for this group of insects include bag-moths, bag-worms and web-worms. They are known for their characteristic cocoon-like structures fashioned from twigs, leaves and other materials, which are usually found in the branches of trees and shrubs. These caterpillars are considered as pests due to their tendency to defoliate trees. They are commonly found in North America, Europe and Asia. Despite the widespread negative effects they can have on ecosystems, their intricate cocoons and unique behaviors make them fascinating creatures to study.