I've been watching some classic Sesame Street from the 80s and 90s and it got me thinking. We know a majority of the human characters speak and understand ASL but how many of the Muppet characters did?
I did pick up on a couple of things. In the episode when Barkley ran away, Oscar didn't understand what Linda was saying but knew that she was mad at him for not helping. In 'Follow That Bird', Big Bird understood her when she told him to read and asked him where the key was but didn't seem to understand her in an early 90s episode.
Oscar did understand ASL. Once there was a street scene with Bob, Linda, Susan, Gordon, and possibly David gathered around Oscar's can. Oscar didn't like the crowd scene and wanted them to scram, so the humans made a bet with Oscar to see who would leave, him or them.
Oscar proposed if they could say "She sells seashells by the seashore", he would leave. But first, he made them stuff their faces full of saltines, which made their mouths so dry none of them could speak. Except Linda could sign it with her hands, and Oscar read her signing out loud, found he couldn't win the bet, and slammed his lid post haste.
Doesn't make too much sense, but I guess you had to be there.