Forensic entomology establishes the postmortem interval (PMI) by studying cadaveric fauna. The PMI today is still largely based on tables of insect succession on human cadavers compiled in the late 19th- or mid-20th centuries. In the last few years, however, the gradual warming of the climate has been changing faunal communities by favouring the presence of thermophilous species. To demonstrate how globalization and climate change are overcoming geographic barriers, we present some cases of southern and allochthonous species found in north-east Italy during our entomo-forensic investigations.