PATRICK LANDMANN / SCIENCE PHOTO LIBRARY PATRICK LANDMANN / SCIENCE PHOTO LIBRARY
Cave spider. Close-up of a Lascona cristiani 'sac spider' This predatory arachnid is found only in the Movile Cave, Romania, where life has been cut off from the outside world for the past 5.5 million years. It has evolved in total darkness over that time and has lost its eyes and colouration as a result.
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