Hi, thanks for the question.
 
Like the majority of websites on the internet, the ads on BYC keep our wonderful site free for our visitors to use.  Unlike most sites though we provide our members with a way to upgrade their accounts to enable them to turn off advertising. You can do this by purchasing a 
Premium Feather Membership: https://www.backyardchickens.com/articles/byc-premium-feather-membership-upgrade-pfm.47730/
 
Please keep in mind that hosting and maintaining a site like BYC is very expensive.  We know many visitors do not want to see advertising. Some people block ads, but we appreciate visitors that upgrade their membership to a 
PFM.  This is definitely the appropriate way to use the free services of the site without advertising.
 
We try 
VERY hard to find chicken-only advertising, but it's very difficult to find enough niche specific advertisers that are interested in sponsoring a site like BYC.   When that happens we need to turn to third parties (like Google AdSense) to supply the ads, and unfortunately we have much less control over what ads they display.
 
With that said, we're always working very hard to have related and appropriate ads on BYC, so if you see an ad that is inappropriate (compared to other sites on the web like Cnn.com Yahoo, etc.) please let us know!
 
Ugly - Loud - Annoying - Inappropriate Ads:
To find and remove the ad we need to know as many details about the ad as possible.  We work with 
many ad networks which makes it difficult to track down who is showing a specific ad.
 
If you see an inappropriate ad, here is what we need:
 
- A screenshot of the ad on the site (how to do a screenshot)
 
- The time & day(s) you saw the ad
 
- The "click URL" of the ad. One way to get this is to hover-over the ad and right-click and copy the link URL.
 
- PM to a Staff member or email to Support
 
(Note: for the ads that are inappropriate that slip through our filters, you probably won't want to click the ad.  Hopefully you can still grab some info about the ad to make tracking it down easier)
 
Again, we are anxious to make sure these kinds of ads don't sneak through, so we need as much info as possible to remove them.
 
Thanks!