What you see are fly eggs turning into larvae that will feed on the body. This is quite common in open areas where there is a corpse, where flies can land on the body. These will lodge in the body's natural cavities (eyes, nose, ears, mouth, anus and vagina in women). The science that studies larvae and insects to estimate the time of death is called Forensic Entomology.

This happens because flies, especially those of the Calliphoridae family (blowflies), are attracted to decomposing organic matter. They lay their eggs on corpses, and the larvae (maggots) feed on the decomposing tissues. This process is essential for the recycling of organic matter in nature. In forensic entomology, the presence and stage of development of these larvae help to estimate the time of death (PMI – Post-Mortem Interval). This is because different species of insects colonize the body at specific times during decomposition. In addition, factors such as temperature, humidity and access of insects to the body influence the speed of the process. The study of insects on corpses is a valuable tool in criminal investigation and can help to understand the circumstances of death, such as whether the body was moved or exposed to chemicals.