Pocket Science – T.rex the nose-loving tyrant leech king, why losers ejaculate more, and how cuttlefish could “see” with their skin

Three years ago, a nine-year-old girl was admitted to La Merced hospital in Peru with a headache that had lasted for two weeks and a strange “sliding sensation” in her nose. Her parents quickly discovered the source of the problem – a sizeable black worm lodged up her right nostril. They quickly sought medical help and it came in the form of Dr Renzo Arauco-Brown, who “with some effort” removed a seven-centimetre leech from the girl’s nose. Brown sent the animal to leech guru Mark Siddall from the American Museum of Natural History, who immediately recognised it as a new species. Uniquely among leeches, the bloodsucker had a single jaw (most have three) but it was lined with eight

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