I was hoping someone knew where to find some bird-like CC for Sims, such as beaks, feathers, etc. I really want to recreate some Animal Crossing villagers in my game but for the life of me all I'm finding is CC from the Sims 3. Any help is appreciated!

Bird sims are something I am currently struggling with myself - which is how I came across your WCIF - these aren't amazing but I hope they can still be of use to you

Duck Beak: https://marislime.tumblr.com/post/1...th-very-bad-has
(In hats/female)

Things that I've (mildly desperately) used as a beak before:
https://www.thesimsresource.com/dow...ask/id/1378637/
https://truth-has-no-face.tumblr.co...-facepaint-this

Feathers:
https://fantasycclove.tumblr.com/po...hers-and-leaves

(You didn't mention bird wings? But these are my favorite: https://fantasycclove.tumblr.com/po...om-mmd-wings-by)

Hope these are somewhat useful! (And if you have more/better, I'd love to have them!!!)