Note: Looking up Glockenspiel it seems that is not a very good term for the Decoy Family which heroically provided refuge to the countless other Decoys.
In Mortyplicity, doubtless eons after the events involving the numerous Decoy Families, Glockenspiel Jerry (I was thinking of them as puppets/marionettes -- not sure why called that) who has been largely dismantled by beavers and probably worn by time, is discovered by what is described as dolphin/woodpecker bipedal creatures and when one asks what he is, the other says, "A relic from a kinder time." One might have thought based on that statement that they intended to help him, but the second creature begins to peck at Jerry's head.
My question is, what was meant? That in this kinder past there was the leisure to create such things or simply that wood was plentiful? Both seem plausible as the world they inhabit is quite desolate.