Unfortunately, the available search results do not provide sufficient information about a US nonprofit organization named "Gray Ducks" with an EIN of 813821823. However, I can suggest a general template for an article, but it cannot be completed without specific details about the organization.

Gray Ducks

Gray Ducks is not identified as a prominent or well-documented nonprofit organization in the available search results. To create an accurate Wikipedia-style article, more specific information about the organization's mission, history, and activities would be needed.

Mission

Information about the organization's mission and purpose is currently unavailable.

History

Specific details about the founding and history of Gray Ducks are not present in the available data.

Activities

The organization's activities and impact remain unreported in the provided search results.

Conclusion

Without further information, it is not possible to provide a comprehensive article about Gray Ducks as a US nonprofit organization.

[1] https://grayduckgrit.com/giving-back/ [2] https://grayduckart.com/fundraisers [3] https://www.youtube.com/watch?v=oE-2g1ka6WE [4] https://www.graypanthersnyc.org/ourallies [5] https://grayducks.com/start-a-team