Nuiqsut

The brant was identified as OR2, a three-year-old male.

This bird had been banded as a gosling by biologist John Pierce near Nuiqsut, on the delta of the Colville River along Alaska's Beaufort Sea coast, as far north as you can get.

And here's the amazing part.

Nuiqsut is about 1,800 miles north of Fort Flagler, as the crow flies.

Think about that.

A brant hatched on Alaska's Arctic coast traveled all the way down to the spit on Marrowstone Island, and when they arrive here, they feed on eelgrass, which I think you mentioned, often timing their feeding with the falling tide when the eelgrass become accessible.