I don't know why this Common Myna graping this piece of leaf. Initially I thought that was a food, because its struck that to the perch (as if to kill an insect). Maybe its going to make a nest.
They build bulky nests in tree cavities, pockets in buildings, and in heavy vegetation. Females lay four to five glossy, pale blue eggs. The incubation period is thirteen to eighteen days. Both parents incubate the eggs. The nestlings may leave the nest at around twenty-two days or longer, but may still not be able to fly for another seven days or so.(Refer: here)
(Wikipedia: here)
