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This link potentially matches multiple versions of "Stirge":

• Stirge (System Reference Document 5.2)

  CR 1/8 · Monstrosity (Small)

• Stirge (System Reference Document 5.1)

  CR 1/8 · Beast (Tiny)

• Stirge (Monstrous Menagerie)

  CR 1/8 · Beast (Tiny)

• Stirge (Black Flag SRD)

  CR 1/8 · Beast (Tiny)