在哥斯达黎加的一家动物园里，人们发现了首个美洲鳄单性繁殖的案例。这只雌性美洲鳄产下的胎儿与母亲的基因相似度达 99.9% 。 The egg was laid by an 18-year-old female American crocodile in Parque Reptiliana in January 2018. The foetus inside was fully formed, ...