Dennis Minsky is back on the beat in Provincetown, and on his recent survey, he turned up these intriguing specimens. The first is little more than a skull and string of vertebrae, and the second, though more intact, is quite well rotted. Still, I have faith that you Seanetters may have some ideas.

Bird A: culmen reported as 35mm, but it can be hard to tell when all the feathers and skin are gone…
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Bird A may be a Thick-billed Murre (Uria lomvia)
Bird B looks like a Long-tailed Skua (Stercorarius longicaudus)