I suppose if one notices it once, one would continue to notice more easily, and that's what happens with coming across on more than one occasion what is known as bird passing or casting pellet. It's a movement that allows a bird to remove indigestible materials from its internal.
And what's interesting with this Asian Brown Flycatcher was how the pellet was cast with a gluey 'saliva' attached which could be part of the indigestible.
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