The study in question was of Nile lechwe, an endangered antelope.
研究的对象是尼罗河驴羚，一个濒危的羚羊品种。
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Lechwe rest as the setting sun casts a purple glow over Botswana's Okavango Delta.
夕阳西下，博茨瓦纳的奥卡万戈三角洲被一片紫色的光辉所照耀，驴羚正在休息。
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The reason this is interesting is that a lechwe mother is three times as likely to die while giving birth to a son (or during the subsequent week) as when she bears a dauhter.