Slaughterhouses which permit entry to a photojournalist are exceptional cases and, in the rare case that this happens, it is usually forbidden to capture the moment in which the animals are killed. Mexico is one world’s largest producers of beef, chicken and pork meat. At the end of 2015, after various failed attempts, I was able to enter 2 slaughterhouses in the state of Jalisco and photograph their practices. This was the beginning of the investigation which has now extended to 58 slaughterhouses and which now encompasses a comprehensive account of what happens there behind closed doors.