"What is this thing?"
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Bug refers to multiple subjects in the Metroid series. You may be looking for:
, insects native to Zebes
, larval creatures native to Bryyo
, mature creatures native to Bryyo
, bat-like creatures seen in Area 1 and Area 7
, creatures seen in Area 2 and Area 5
, fish-like creatures seen in Area 5
, a slug-like creature seen in Area 6
, unintended bugs and errors in a game's programming