I'm not sure if this is just coincidence, but I went to my first franchise zoo yesterday to check out what cheetahs I had there and within about 15 mins, 5 died of old age... I hadn't played this zoo for a while as it seemed to develop a lot of problems, mainly haemorrhaging money. Also I discovered a whole bunch of Red Pandas in a pen which I'm sure only had a pair in last time I played. I thought time stopped when you were not playing... am I wrong? or is this a bug?