Cold joke+one-sentence answer

A chicken and a goose were put in the refrigerator, and the goose died! Why isn't the chicken dead? Because it's frozen chicken! Or the goose died because it was a penguin! Or they are not dead, because they are frozen chickens and penguins! A chicken asked her mother why I only like bracken and other chickens don't eat it. My mother said, because you are an excavator.