) These studies found a direct relationship between ambient temperature and mortality during transportation, based on observations in Northern European countries, which showed that mortality increases steadily between 10ºC and 18ºC before rising sharply at higher temperatures. In Southern countries, such as Spain, similar studies did not find such a clear relationship.(13) On the contrary, higher mortality rates were found in October and November, far cooler months, largely because extreme
precautions are taken in the summer, when average temperatures are over 25ºC.