Solution

The phoenix is a mythical bird.

✅ Correct adjective: "mythical"

Explanation:

• The phoenix is a legendary bird from mythology that is said to rise from its own ashes after death — so it is not real, but mythical.

Why not the others?

• Ethical – ❌ relates to morals or principles, not suitable here.

• Natural – ❌ suggests it exists in nature, but the phoenix is fictional.

• Carnivorous – ❌ means meat-eating, which doesn't fit the context as we're focusing on its existence, not diet.