Why does chocolate covered peanuts kill mice?

Online Answer
As the sugar content goes down and the cocoa content goes up in the darker chocolates there is more theobromine, which makes it taste more bitter. This bitter taste could be putting the mice off. Theobromine is also poisonous to some mammals, especially dogs and cats.
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Chocolate is a product that doesn't actually have an expiration date. Instead, it has a best before date. ... An expiration date, which is actually called a use-by date, is only included for products that are unsafe to eat after a certain period. Chocolate is safe to eat after its best before date.