Paul Higgins and Steve Carr got these pictures of the Mew Gull that was found at the Antelope Island Causeway in the Great Salt Lake.
  

                                                         by Steve Carr    ©Steve Carr
"The bird is the one in the center standing on a rock. Note that it is slightly smaller than the larger Ring-billed and California Gulls behind it; and that the bill is noticeably smaller than the others' large bills."  ~ Steve Carr