Birds whistled. Those were the ones with heads as grey and furry-looking as little mice. There was an endless shushing noise, as if the Dnieper River had slipped the chains of its bank in the
night and lay sighing on the doorstep. The goats in their pen made sleepy bleating sounds
Faintly, from the car
park above, came the banging and scraping of garage doors, the ratitler in.
engines and the soft squishing of tyres in the sand. The trolleybus wires sang their thin,
twanging song.

why does the writer make the first paragraph a description of different sounds?​