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. Birders throughout the state have volunteered their time and knowledge to write the birding site descriptions and to produce this website, but MOS has ongoing costs for website hosting and maintenance. If you are benefiting from using this Birder’s Guide website, please consider making a tax deductible donation to MOS.

To donate to the Birder’s Guide to Maryland & DC, just click on the Donate button and you will be redirected to the donation page on the Maryland Ornithological Society’s website. Donations can be made online, or you can follow the provided instructions to send a check by mail. We appreciate your support!