Insects and other arthropods Insects and other arthropods such as bugs, creepy crawlies, and no-see-ums interact with human beings in the ecosystem. Arthropods form the highest percentage of animals on earth. In existence, over one million arthropods species are living almost in different regions with various climatic conditions. There are, however, some arthropods like cockroaches, among others, that prefer living in a similar environment with human beings. In the course of coexistence between the arthropods and human beings, they end up sharing resources. A portion of the population is terrified and also disgusted by arthropods, and therefore they end up killing them the moment they come in contact. Arthropods play very crucial roles on earth. The roles are, however, both