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View Diary: Marine Life Series: Mermaid’s Purses (25 comments)

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  •  great stuff (7+ / 0-)

    especially this part which I didn't know before. Fascinating.

    There is a small hole about halfway up each of the four "horns" of the egg case.  The embryo must continuously pump new seawater into the case.  It does this by inserting its tail into one of the corners and wagging it vigorously.  The water pumped in one side forces old water (now polluted with wastes and CO2) out the opposite side.  If one of these holes gets plugged with debris the skate will rotate its body around and use one of the other horns.

    The trick is in what one emphasizes. We either make ourselves miserable, or we make ourselves happy. The amount of work is the same." Carlos Castaneda

    by FireCrow on Fri Apr 18, 2008 at 07:03:45 PM PDT

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