Wandering whistling duck

It was raining very heavily and going by their demeanor these Wandering Whistling ducks (Dendrocygna arcuata ) did not like the rain a bit.  They spent most of their time (we were there for a whole day) on a tree top rather than on water.
The are called whistling duck because  of the loud whistling calls and the whistling noise their wings make during flight. Wandering because, they keep migrating from permanent wetlands along the coast to ephemeral ones that are formed inland during wet weather.
These birds feed on aquatic vegetation, seeds, the bulbs of plants and other herbage, insects and small aquatic animals. Pairs mostly bond for life.