科学家们还试图利用雌蟒在繁殖期发出的气味引诱雄蟒掉入陷阱。
Scientists are also trying to lure male pythons into traps using the scent that females emit at breeding time.
阿拉斯加地区的海象——尤其是正处于繁殖期的雌海象，在夏秋季节通常活跃在北极的大片浮冰上。
Alaska's walrus, especially breeding females, in summer and fall are usually found on the Arctic ice pack.
科学家在繁殖期观测这些鸭，并着重注意雌鸭何时准备生蛋。
Scientists monitored the birds during the breeding season and noted when the female birds were preparing to lay eggs.
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