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This link potentially matches multiple versions of "Axe Beak":

• Axe Beak (System Reference Document 5.2)

  CR 1/4 · Monstrosity (Large)

• Axe Beak (System Reference Document 5.1)

  CR 1/4 · Beast (Large)

• Axe Beak (Monstrous Menagerie)

  CR 1/4 · Beast (Large)

• Axe Beak (Black Flag SRD)

  CR 1/4 · Beast (Large)