These Sandwich Terns were part of the dilapidated pier gang (which included brown pelicans, laughing gulls and double-crested cormorants). They chose to hang out at the very end of this old, out of commission pier at the Excellence Resort Cancun Riviera. At first I thought they were gulls, but the more I researched the more I had trouble finding one with the distinct long, black narrow beak with the white tip at the end. That's when I found pictures of the Sandwich Tern in non-breeding plumage that were a close match!
Adventures in New England birdwatching.