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Dinosaur-like cryptid that supposedly lives in the Congo. This and post #293317 make reference to it but I haven't the faintest inkling why.

Ah, I did a little research and it comes from Aya's story mode in SWR: http://touhou.wikia.com/wiki/Scarlet_Weather_Rhapsody:_Aya%27s_Scenario#Stage_4

She just wants to play, but they think she'll be too serious and suck all the fun out of the room.