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 I think it is likely to be the mirror effect, ie
the stress at seeing their reflection, combined with what (as I recall from uni
days half my life ago), mouse biologists called "open field
emotionality". That is when they are excited or nervous, they poo a lot.
The Superb Fairy-wrens I had breeding in my yard did exactly the same thing on
my blue Land Rover (even in the dark carport) or a visiting white
sedan. 
Philip  
    Hi all for quite some time (many
    months) now I've had Rufous-banded  Honeyeaters 'soiling' my car. Birds
    perch on the external rear view  mirrors and then leave their droppings.
    Today, one seemed as if it  were waiting for me to get home - little
    sooner than I'd shut my door  after getting out of the car, one was
    sitting on the mirror. A few  minutes after it was doing its droppings,
    almost as if it had waited  all day for me. My question is, why is
    this happening? When perched on the  mirror, the birds look a little as
    if they may be checking the place  for insects, but this doesn't last
    long. They look a little as if they're  interested in their reflection
    but this doesn't last long either. It really  seems the main thing
    they're doing is using my car for a toilet. Any  comments?
  Happy
    birding & turding Niven
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