But sometimes the tables are turned, as in the case of the bluestriped fangblenny (Plagiotremus rhinorhyncos), a small but sinister predatory fish. Evolved to perfectly mimic the bluestreak ...

Evolution is a master recycler. It often uses old structures (or ancient genes) for new jobs. The mammalian ear is a perfect example. Over the eons, the jawbones of our fish ancestors became three ...