English PARA QUE UNIT [4M]

The rains have heralded the arrival of some seasonal visitors several thousand leeches. a leopard, and Yesterday afternoon the leopard lifted a dog from near the servants' quarter below the school. In the evening it attacked one of Bijju's cows but fled at the approach of Bijju's mother, who came screaming imprecations.
As for the leeches, I shall soon get used to a little bloodletting everyday.
Other new arrivals are the scarlet minivets (the females are yellow), flitting silently among the leaves like brilliant jewels. No matter how leafy the trees, these brightly coloured birds cannot conceal themselves, although, by remaining absolutely silent, they sometimes contrive to go unnoticed. Along come a pair of drongos, unnecessarily aggressive, chasing the minivets away.
Questions:
(1) Who were the seasonal visitors? Why are they called so?
(2) How were Bijju's cows saved ?
(3) What will the writer get soon used to?
(4) Why do minivets sometimes contrive to go unnoticed?

August 3
The rain stops. The clouds begin to break up, the sun strikes the hill on my left. A woman is chopping up sticks. I hear the tinkle of cowbells. In the oak tree, a crow shakes the raindrops from his feathers and caws disconsolately. Water drips from a leaking drainpipe. And suddenly, clean and pure, the song of the whistling thrush emerges like a dark sweet secret from the depths of the ravine.
August 12
Endless rain, and a permanent mist. We haven't seen the sun for eight or nine days. Everything damp and soggy. Nowhere to go. Pace the room, look out of the window at a few bobbing umbrellas. At least it isn't cold rain. The hillsides are lush as late-monsoon flowers begin to appear - wild balsam, dahlias, begonias and ground orchids.
Questions:
(1) What is the crow in the oak doing after the rain stops?
(2) From where does the song of a thrush come ?
(3) Why hasn't there been the sun for eight or nine days?
(4) Describe the scene outside the room.