In this remarkable turn of events, a Brazilian rainbow boa named Ronaldo, thought to be male by his caretakers, recently gave ...

Every year has its breakout stars, and 2024 yielded a bumper crop: Glen Powell, Chappell Roan, Pommel Horse Guy. But only one ...

PARTHENOGENESIS occurs naturally in several orders of insects, and can conveniently be classified according to the sex of the offspring which develop from the unfertilized egg: (1) arrhenotoky ...

鲨鱼孤雌生殖的时候就只会生下女儿，而有些雌性动物的孤雌生殖则会生出儿子。2006 年，英国一家动物园里的一只科莫多巨蜥也出现了孤雌生殖。雌性科莫多巨蜥携带 WZ 性染色体，而雄性的则是 ZZ。当发生孤雌生殖时，雌性只能产下 WW 或 ZZ 的卵，由于 WW 的卵无法存活，因此只有 ZZ 蛋能成功孵化，于是后代就都是雄性。

The discovery that condors are capable of virgin births - formally called parthenogenesis or asexual reproduction - surprised scientists. Virgin births have been recorded in other bird species ...