An 'Extremely Rare' Half-Male, Half-Female Bird Temporarily Took Up Residence Outside of Chicago
长相不寻常的 bobolink 就是所谓的双侧雌雄同体。这只鸟的行为像雄性，最终追求配偶并抚养雏鸟
Female birds have shorter lifespans than male birds, researchers find
加州大学洛杉矶分校的研究发现，雌性鸟类成年后的存活率要低 12%。
