California condors can reproduce without males through a process called parthenogenesis
In short: For the first time, researchers have observed asexual reproduction in California condors. This rare phenomenon, where an egg develops into a chick without fertilization, suggests that reproductive tricks once thought limited to reptiles might be more widespread among birds than previously understood.
In a study published in The Journal of Heredity on October 28, researchers from the San Diego Zoo Wildlife Alliance revealed that two deceased condors were born through parthenogenesis. Often called 'virgin birth', this phenomenon happens when specific cells from a female's egg act like sperm and merge with it. While asexual reproduction is common in lizards, sharks, and rays, it is a rare occurrence in vertebrates.
The discovery was entirely unexpected for scientists working to save the endangered species. The San Diego Zoo Wildlife Alliance's conservation genetics director, Oliver Ryder, stated that the group's main goal was not finding parthenogenesis, but rather the rigorous breeding and reintroduction efforts needed to stop extinction. Interestingly, the two birds involved, identified by studbook numbers SB260 and SB517, had different mothers, and both mothers had been housed with males and had successfully reproduced with them previously.
The implications of this finding are significant for evolutionary biology. It suggests that occasional parthenogenesis might be more widespread throughout the reptile family tree and even among bird relatives, potentially extending to extinct groups like dinosaurs. While scientists have recorded self-fertilization in captive birds like chickens and turkeys—often when males are absent—the condor case is the first time this has been documented in the species. Currently, conservation efforts continue to manage the population, which has grown from a low of 22 or 23 birds in 1982 to over 500 by 2019.
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Sources
- Summary by Intellect · source: Condor Females Don’t Need a Male to Hatch Chicks
- Also: Newly Recorded Condor ‘Virgin Birth’ Is Another Way Birds Are Like Reptiles
- Also: Endangered birds experience 'virgin birth,' a first for the species
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