Big Bird does a thing

From a children's lesson in... August, I think? I was teaching them about colours through the wonder of painting. Everyone was supposed to find a picture they liked (from the classroom's selection of children's books) and copy it. So, this was mine -- from some book where Big Bird goes around cruelly mimicking everyone he encounters.

He's copying the pigeons here, not Bert -- but you can tell it's really getting to Bert, poor miserable bastard.