It’s the unofficial/official/adopted mascot of nostr. I indicate unofficial only because there are no official officials. Lol. Just sort of the current social consensus. Credit to @Walker as I understand it!
I’m always on the lookout for new takes on nostr, its history, and potential. And when finding the answer for you I learned a lot more.
So I’ll site a quote/link from Sovryn Matt’s article for this.
Sovereign Matt
#[2]
“Included in the creative content during this time were the famous purple ostrich AI artwork memes that you may have come across. Nostr is represented by the purple ostrich because the famous bitcoin comedian/content creator/educator @Walker asked ChatGPT to tell him a joke about Nostr and because the mobile app Damus had a purple color. The purple nostrich became a mascot for Nostr and the idea eventually stuck.”
Thank you for the question. It helped me learn a little more. #plebchain please show some love to Colten.