David McKenzie, former Lead World Designer on New World, did an AMA on Reddit, leaking that he had put a Wall Chicken, Castlevania Easteregg, inside the game over at Castle Dracula.
After a few days worth of searching, I finally found this.
Thanks to DedAbebe for finding out the general area of the Wall Chicken by going through gamefiles, Kydl and PsycoSam for helping to look around, and Sup3rlativ3 for the tips to break through.
Although, I would dare to say that this isnt a Wall Chicken. It's a Wall Turkeyton - and it's still steaming!