Hmm... There's something I've never understood here... just why is it that
small birds come out when they hear a sound that makes them think there's a
predator around. Shouldn't they hide??? - Teresa Michelsen
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>Birds become
>pish-refractory, eventually going away ("hmph, there's no predator here"),
>and I don't think they will respond to it for some time thereafter (but
>have no idea how long). - D.P.