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I don't think we as humans are intelligent enough to find an answer to questions like these. Let's hope some highly intelligent type III civilization of species will discover us and give us an accurate answer.

penguin eat fish, penguin are fish. You are what you eat, and that is exactly what a penguin eats, so. A penguin who eats a fish is a fish, and if a penguin eats another penguin then they are a fish as well because that penguin is a fish, and it is what it eats.