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澳洲布里斯本录得全球第2宗半同卵双胞胎个案，科学家指情况极罕见，因半同卵双胞胎存活机会不大。一名孕妇于2014年诞下龙凤胎，当时她28岁，属自然怀孕，亦是医学界首次有孕妇在怀孕其间，就发现半同卵双胞胎的案例，收录于《新英格兰医学杂志》。

主诊医生菲斯克指，“孕妇怀孕六周时进行超声波检查，单一胎盘和羊膜囊的位置，显示她怀有同卵双胞胎。但她怀孕14周时再照超声波却显示，婴儿是龙凤胎，但同卵双胞胎而言是不可能。”

半同卵双胞胎是指单一颗卵子同时跟两颗精子结合后分裂，产生3套而非两套染色体，研究员指胚胎因此难以存活，直至2007年美国才录得全球首宗个案。

另两种较常见的双胞胎，其中一种是同卵双胞胎，即单一颗卵子受精后自然分裂成两个胚胎，两者的染色体、基因等均接近完全相同。另一种则是异卵双胞胎，两颗卵子各自受精后形成两颗受精卵，发育成两个独立胚胎，各自有独立的遗传基因，故有机会是龙凤胎，外貌特征未必相似，常见于较年长的孕妇，因她们较易于月经时排出两颗卵子。