KIDS was a magazine from the 1970s, made for kids, by kids.
Issue #20 included a behind-the-scenes article on Sesame Street, titled "Yes, but what is a Snuffleugapus (sic) or creating the illusion of Sesame Street". The article featured behind-the-scenes photos of the unaired version of "Imagination", as well as some drawings of characters, including Big Bird (showing how he is performed), Sam the Robot, and Mr. Snuffleupagus.