Looks like a lot of Muppets.
Per the National Museum of American History:
Puppets line up to meet the media at today’s donation ceremony. Today would have been Jim Henson’s birthday. The Henson family donates 20 puppets today, including Cookie Monster and Miss Piggy. The puppets won’t be on view immediately, but stay tuned for details of our “American Puppetry” display opening in November. #puppets #jimhenson