Lack of Insect Life : If normal insect activity (ground, air, and/or water) is missing, then check the ground/water surface/shore line for dead insects. If near water, check for dead fish/aquatic birds
Central Intelligence Agency CIA, Chemical/Biological/Radiological Incident (CBR) Handbook, Section H. Glossary of Biological Terms, The Office of Public Affairs (OPA), Central Intelligence Agency (CIA) Washington, DC, USA 1998. https://www.fema.gov/vii-glossary-terms, (D/CBRN - Amer) {814}
