@Yoric, your smart-cats comment has reminded me of an MP (Military Policeman) I knew nearly fifty years ago at an airfield where I worked. He had a dog that he claimed was incredibly smart and was often boasting of his abilities . One day, the dog was run over and it died. The driver did not stop nor report the accident but, according to the MP, before the dog died, it scrawled the number of the car on the road using its own blood. I thought it was good to know that the airfield security was in such safe hands.