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If you go to this page
, the picture is about a third of the way down the page on the right hand side with the description: `Big Bird visits the Big Blue House: "When the first season was shot upstairs from Sesame, Caroll snuck Bird upstairs"`.
The citation explains that the image is from "Noel MacNeal on Facebook, October 18, 2018 (private post)",
Edited by ApeAccount

There has been two images used in Bertstrips showing Big Bird and Bear meeting.
https://www.reddit.com/r/bertstrips/comments/dl23wd/hell_meet_a_lot_of_other_bears_up_there/
https://www.reddit.com/r/bertstrips/comments/as5pq8/this_was_the_worst_tragedy_prior_to_911/
I've been trying to find the origin of these images for some time now to no avail. I tried looking on the list of Bear in the Big Blue House appearances on the Muppet Wiki and couldn't find anything. All that I know is that it might have been before the We Are Family video that Bear and Big Bird appeared in with other characters like Barney. I figured others in the community would be of help in identifying the source. I'll be grateful if anybody could have any tips and suggestions.
Edited by DongwaChan