Not all the creatures at the Monterey Bay Aquarium swim in the water. Here's a case in point; this guy, officially titled Phalaropus fulicaria, or more commonly "red phalarope" swims on top of the water. While spending some of its time on the seashore, the red phalarope spends long periods out at sea. In California they are also common at Lake Mono where they feed on brine shrimp in the very salty waters of the lake, building up fat supplies for their long migrations.
You can read more about the red phalarope at the Monterey Bay Aquarium website.