My daughter's life and death lesson came when she was 2. She had some fish and a frog (named 2...they were all named 2 because that's how old she was and what she decided to name them). I taught her how to feed them so she knew how to open the lid on the tank. One day I walk into the livingroom to see the tank water super cloudy. Turns out Suraya thought the freshwater fish and frog were hungry so she fed them salty peanuts...needless to say they did not survive.