<story><title>First confirmed hatchings of two California condor chicks from unfertilized eggs</title><url>https://stories.sandiegozoo.org/2021/10/28/san-diego-zoo-wildlife-alliance-conservation-scientists-report-first-confirmed-hatchings-of-two-california-condor-chicks-from-unfertilized-eggs/</url></story><parent_chain></parent_chain><comment><author>penneyd</author><text>This article has a bit more detail and describes the health issues these birds experienced&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.theatlantic.com&amp;#x2F;science&amp;#x2F;archive&amp;#x2F;2021&amp;#x2F;10&amp;#x2F;california-condors-are-capable-virgin-birth&amp;#x2F;620517&amp;#x2F;&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.theatlantic.com&amp;#x2F;science&amp;#x2F;archive&amp;#x2F;2021&amp;#x2F;10&amp;#x2F;californ...&lt;/a&gt;&lt;p&gt;&amp;quot;both of the condors did have some documented health issues. SB260, a male hatched at the San Diego Zoo Safari Park in 2001, died two years later after being released into the wild—he was always small and did not integrate well with the wild birds. SB517, a male hatched at Los Angeles Zoo in 2009, had a curved spine and trouble walking. He was never released into the wild and died in captivity at about age eight.&amp;quot;</text></comment>
<story><title>First confirmed hatchings of two California condor chicks from unfertilized eggs</title><url>https://stories.sandiegozoo.org/2021/10/28/san-diego-zoo-wildlife-alliance-conservation-scientists-report-first-confirmed-hatchings-of-two-california-condor-chicks-from-unfertilized-eggs/</url></story><parent_chain></parent_chain><comment><author>bencollier49</author><text>So in birds, sex chromosome arrangement is a reverse of what we have in humans. Their males are ZZ and the female is ZW. Which is why only males appear from this parthenogenesis.</text></comment>