Found on the beach. Released in peace.
Front claws were absent. It was still alive, but probably not for long...
I thought this was a GRSC in the field, but looking at the photo, it might be a LESC whose head feathers appear a little different because the duck had just come up from a dive.
Finally found a candidate for Greater Scaup. In flock with 8 Lessers, but with noticeably larger/straighter bill.