The forensic biologist takes soil samples from the scene of the crime and collects grubs, insects and larvae as exhibits. The composition of the insect species, as well as their age and size, are typical for specific phases of decomposition, as each species will settle on a corpse and leave it again at a specific time. The soil samples and samples of matter adhering to the clothing of the victim are examined with a stereomicroscope and the insects found are secured, sorted and identified. The zoological identification can also determine whether the victim was killed at the place where the corpse was found. Larvae or pupae are permitted to develop and the duration of the individual phases leading up to the adult fly are registered.