求翻译：A blacktip shark is seen in this undated handout image released on October 10, 2008. Scientists using DNA testing have confirmed the second-known instance of "virgin birth" in a shark - a female of this species samed Tidbit that produced a baby without a male shark. The shark died after being removed from the tank at a Virginia aquarium for a veterinary examination, and a subsequent necropsy revealed that Tidbit was carrying a fully developed shark pup nearly ready to be born. Virgin birth, known scientifically as parthenogenesis, also has been documented in Komodo dragons, snakes, birds, bony fish and amphibians.是什么意思？

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