A little stickleback fish (Gasterosteus aculeatus) nicknamed “Mary” appears to have leapt across a major reproductive divide on the evolutionary tree of life. Stickleback females, like most female fish, lay unfertilized eggs that males then fertilize in the nest. But Mary, somehow, got pregnant with healthy live young, which survived delivery via C-section.

This is the third time that scientists have found an unfertilized egg-laying fish with developing embryos in her belly, the researchers reported in

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