'Yellow-billed Babbler' - Turdoides affinis taprobanus, Avissawella, Sri Lanka.

The noisiest group of birds in the garden they forage in groups and are also called 'Seven sisters'. These and the squirrels keep a look-out for cats and other predators and signal each other on the latters presence in the vicinity.

Video:-

http://www.youtube.com/my_videos_edit?ns=1&video_id=21jMt-OqyzQ