A female sand tiger shark will begin a pregnancy carrying multiple embryos. Only two – at most – ever emerge
It makes for gruesome but fascinating reading.
In 1983, marine biologists published an in-depth study of the embryonic development of the sand tiger shark, (Carcharias taurus), also known as the grey nurse shark. The paper is noteworthy for one particular detail, summed up by the following sentence:
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Source: Guardian Environment