What tactical condition might indicate the use of biological weapons?

The indication of biological weapon use can often be inferred from an increase in dead or sick animals and insects. This occurs because biological agents typically target living organisms, and their effects can be observed in animal populations before they manifest in humans. An unusual spike in animal morbidity and mortality can serve as an early warning sign of contamination in an area, suggesting the deployment of biological weapons.

When such incidents are reported, it raises the alarm for military and health personnel to investigate further for possible exposure to biological agents. Historically, various biological agents have been designed to affect specific species, and their negative impact on wildlife can be a critical indicator of larger biological warfare scenarios.