Here are the possible solutions for about 80 of the world's species according to the smithsonian clue
Answer
Clue
Relevancy
insects
Clue
About 80% of the world's species, according to the Smithsonian
Definition
INSECT, a word loosely used for a small invertebrate creature, esp. one with a body divided into sections; in zoological terms, a member of the Insecta