BirdPhotos.com will place your ad on this site for free, if it is relevant to bird photography, birds, 'birding', or conservation. For for-profit companies, this program works on the honor system; should you generate business from this site, you should send us the appropriate commission. Then we will play your ad with increased frequency.
Please send the ad along with the link, to email@example.com. Note that we reserve the right to not show any ad for any reason.