Learned from this observation https://www.inaturalist.org/observations/73204495 and this podcast https://www.alieward.com/ologies/corvid-thanatology.
As a general rule of thumb only, may not apply to all species
Australian Raven (long throat hackles):
Image by johncull from observation https://www.inaturalist.org/observations/73929919
Australian Raven (grey down):
Image by namack from observation https://www.inaturalist.org/observations/70477316
Torresian Crow (short throat hackles):
Image by Natasha Taylor from observation https://www.inaturalist.org/observations/73277623
Torresian Crow (white down):
Image by deborod from observation https://www.inaturalist.org/observations/69762255
Image by Richard Yank from from observation https://www.inaturalist.org/observations/69770865
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