The Bornean pitch plant in question (Nepenthes hemsleyana) is part of a mutualistic relationship with the Common woolly bat (Kerivoula hardwickii), in which the pitcher offers the bat a safe place to roost, and in return the bat provides fertiliser in the form of guano (bat poop). Dr Michael Schöner and his team tested the pitcher with a sonar beam and found that it acts as a multidirectional ultrasound reflector. They then experimentally modified the shape of the pitcher, and found that one particular region, known as the orifice, helped bats locate the pitcher.
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