If it helps, David Sibley’s field guide The Sibley Guide to Birds discusses the subtle differences between Hooded and Orchard Orioles.
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It’s a good book. I have it in my collection :)
Wow - I’ve just entered an interesting rabbit-hole via reading in the forum about “Identification Rabbit-holes”…I followed your
link to an observation’s discussion, which itself has a link to one of MY observations!!
“the most southern of which is a heavily maculated beetle in New York state.”
(Thank you again @That_Bug_Guy for your ID!)
Wow! Now, where was I, or where am I…? 
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Happy to help! If frigida does turn out to be a distinct species in North America, I’ll have to reidentify all those observations. You may be seeing more activity on your observation from me in the future.
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It’ll be interesting to see what happens! Hopefully you won’t have to tackle them all solo, should they need reidentification.
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I hope I get some help with that too! 265 observations!
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If we want to make this really meta, one could try identifying Lagomorpha from observations annotated “Evidence of presence: Construction.”
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