The Maryland Ornithological Society is a 501 (c) (3) non-profit organization that depends on membership dues and donations in doing its work in support of birds and birders in the State of Maryland. Although birders throughout the state have volunteered their time and knowledge to write the birding site descriptions and to produce the website, MOS has ongoing costs for website hosting and maintenance. If you are benefiting from using this Birding Guide website, please consider making a tax deductible donation to MOS.

We’ve made it easier than ever to donate to the Birder’s Guide to Maryland and DC. Just click on the Donate button and you will be redirected to the donation page on the Maryland Ornithological Society’s website.