dragonfly: slender-bodied non-stinging insect having iridescent wings that are outspread at rest; adults and nymphs feed on mosquitoes etc.
invertebrate: any animal lacking a backbone or notochord; the term is not used as a scientific classification
government accounting office: an independent nonpartisan federal agency that acts as the investigative arm of Congress making the executive branch accountable to Congress and the government accountable to citizens of the United States