雄鸟和雌鸟轮流伏窝。
The male and female birds take turns in sitting on the eggs.
你看，成年雌鸟在产蛋的过程中会在某些长骨内产生一层海绵状的骨组织。
You see, adult female birds during egg production produce a layer of spongy bone tissue inside certain long bones.
雄鸟喙呈红色，有别于雌鸟。
The male bird is distinguished from the female by its red beak.
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