How might insect activity be used in determining time of death?

The relevance of insect activity in determining the time of death stems from the fact that different insect species are attracted to decomposing bodies at specific stages of decomposition. Forensic entomologists utilize this knowledge by identifying the species of insects present, which can provide insights into the postmortem interval (PMI).

As a body decomposes, it undergoes distinct phases—fresh, bloat, active decay, and advanced decay—each associated with the arrival of specific insect species. For instance, blowflies are typically among the first to arrive at a fresh carcass, laying eggs that hatch into larvae. As decomposition progresses, other species, such as beetles, may arrive in later stages to feed on the decaying tissue.

By recognizing which insects are present and understanding their life cycles, forensic experts can estimate the time of death more accurately. This process involves studying the developmental stages of the insects, as they can give a timeline based on temperature and environmental conditions. Essentially, the presence and progression of insect fauna provide a biological clock that aids in forensic investigations.