Ankheg - BeastBasilisk - Beast
Behir - Beast?? (Maybe a creature type for "fleshy creatures made/warped through magic" would be good?)
Bulette - Beast
Carrion Crawler - Beast
Centaur - Fey
Chimera - Fiend? Aberration? Like the Behir, this is a creature created by another creature, so maybe we can keep the "monstrosity" creature type so long as the definition is restricted to "living creatures magic + artificial selection?"
Cockatrice - Beast
Darkmantle - Aberration? Beast? Shadow-creature?
Death Dog - Fiend? Undead? Beast?
Displacer Beast - Fey
Doppelganger - Fey? Aberration?
Drider - Fiend?
Ettercap - Beast or Unseelie Fey
Gorgon - Construct
Grick - Aberration or Beast
Griffon - Beast
Guardian Naga - Celestial
Harpy - Humanoid
Hippogriff - Beast
Hook Horror - Beast
Hydra - Dragon or Beast
Kracken - Celestial (because they were created by the gods) or Beast?
Lamia - Fiend?
Manticore - Beast or Fiend
Medusa - Humanoid
Merrow - Fiend or Humanoid
Mimic - Beast? Aberration?
Minotaur - Humanoid
Owlbear - Beast
Peryton - Beast or Fey
Phase Spider - Aberration? Fey? Beast?
Piercer and Roper - Beast? Aberration?
Purple Worm - Beast
Remorhaz - Elemental or Beast
Roc - Beast
Rust Monster - Beast
Sphinxes - Celestial (I'm honestly baffled they weren't already)
Spirit Naga - Fiend
Tarrasque - Celestial? Beast?
Umber Hulk - Beast?
Winter Wolf - Beast or Elemental
Worg - Beast
Yeti - Humanoid or Beast
Yuan-Ti - Beast, Fiend, or Humanoid
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