Shot in the dark here, but I vaguely remember a blog post that used birds in an explanation for monads and I can't seem to find it again. It had hand-drawn birds, and I think it started out with the identity monad, with the bird representing it only able to speak their own name.

Does anyone remember that post? I'd love to find it again, I got really excited when I saw the title, thinking that it had finally come around again.