We had about 200 hundred sheep in the field next to our runway in January and they weren't in the least bit interested in the aircraft.
Hot air balloons for some reason seem to scare the cr*p out of most animals and they don't really make any noise - apart from the burner.
With most airfield compaints there is more to it than a bit of noise - there is usually an agenda - our biggest noise complainer, who chose to buy a house on the approach to a busy airfield, breeds dogs and generates far more noise complaints from his neighbours over the barking than an airfield ever could.
Let's face it there is noise everywhere in the country - if you want peace and quiet stay in the city and go to the park!