An Adelie Penguin. There was a rookery with approximately 20,000 of them on Brown Bluff.

A group of adelie penguins strolling along the shore.

There was a small Gentoo penguin colony on Brown Bluff along with the Adelie's. I have no idea what this guy was up to but he strutted up and down the beach for a while displaying his prize before dropping it and going for a swim.