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英文原稿
Bald eagles mate for life, unless one partner dies early. Birds in some so-called monogamous species still mate with other partners; bald eagles seem not to.
But when it comes to courtship, they display a spectacular ritual called—death spiral.
The two soar up to high altitude, lock talons, and tumble and cartwheel toward Earth. They let go before reaching the ground. The stunt sometimes could end in a fatal crash.
The courtship display is about determining the fitness of your mate and intensifying your own attractiveness.
It is an interesting tension between succeeding with a mate and maintaining your own survival.
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