Chickens like to chat and report on current events. Like HEY HEY HEY I am laying in egg in here! Or the day-to-day soft bok bok bok bok, which is a happy foraging noise. Or Penny (my alarmist) Everybody its getting dark..no seriously..we should go in.. i am not kidding, I want to go in. Which can be a little shrill and loud. However, it is nothing compared to the neighborhood dogs. (Or the bass mariachi coming from the alley) anyhoo... Here are some plants that will muffle chicken noise from your neighbors, and vice a versa.
[caption id="" align="aligncenter" width="490" caption="Bamboo "]
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Bamboo is a great plant for privacy and noise reduction! Or horsetail reed.
[caption id="attachment_686" align="aligncenter" width="490" caption="horse tail reed"]
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[caption id="attachment_681" align="aligncenter" width="490" caption="Feather Grass"]
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Any tall rustling grass will buffer noise.
[caption id="attachment_682" align="aligncenter" width="473" caption="ok, this is just regular grass..but look how cute!"]
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Also, plants and trees with seed pods will create a natural wind chime effect.
Hopefully this will help when you are designing a perfect chicken backyard.