Javan myna visits my house

I was on my computer desk working and heard chirpings. A quick look reveals a Javan Myna (Acridotheres javanicus) perching near my window.

According to Wikipedia,

"The Javan Myna, also known as the white-vented myna and the buffalo myna, is a myna, a member of the Starling family. It is a successful species in much of South East Asia and has penetrated into India and neighbouring regions.

The Javan Myna is considered a pest, especially in urban areas which they prefer. They deposit droppings over buildings and even on unsuspecting human beings. Their roost also contaminate the ground below by the droppings. Apart from that, they are also a source of noise pollution and are capable of spreading zoonoses. In Singapore, the Javan Myna is one of the species of birds which can be killed by citizens without breaching of law.

They are also available at most Singapore bird shops at a very cheap cost, thus, many of them are bought and release into the wild and damaging the ecosystem of Singapore even further."






I'm not too sure what does the feather-raising action means which I always observe with these mynas. Haha. Any clue?