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Whenever Weepinper walks, it drips a sticky, slightly corrosive substance from its mouth. Trainers that keep Weepinper have been known to push it around in prams, or pull it along in hand trailers, to ensure it doesn't drip anywhere.

Weepinper usually live in water but come out onto land seeking food occasionally. At night, a Weepinper hangs on to a tree branch with its hooked rear and sleeps.