This comes up often but it’s honestly just a coincidence. I sat next to Mod Gee when she made it and I don’t recall chompy birds ever coming up and highly doubt it’s something she would’ve done intentionally.
You are correct that we do re-use a lot of graphics, though usually in - hopefully - more subtle ways. For instance the animations and rig of Sarachnis borrow from the Nylocas from ToB. I also repurposed the base mesh and animations of Tarn Razorlor for the Shaeded Beast. There are also times where we re-colour assets or add to existing wall-kits, the one used in Forthos Dungeon is a combination of a kit created for dragon slayer and another which was made for the mine under myerditch :D
it’s all part of optimising the process as remaking everything from scratch for every update would take too long.