The Pigeon Guillemot is one of the few members of the auk and puffin family to lay two eggs. Nearly all others lay only one egg, but the three guillemots of the genus Cepphus and the four murrelets in the genus Synthliboramphus usually lay two.
The Pigeon Guillemot feeds in shallower waters than most auks, puffins, or murrelets. Although it is known to dive to depths greater than 45 meters (148 feet), it feeds best in waters of only 10 to 20 meters (33-66 feet) deep.
The Pigeon Guillemot often scales vertical rock faces by some vigorous flapping of its wings combined with the use of the sharp claws on its webbed feet.
The oldest recorded Pigeon Guillemot was at least 15 years, 2 months old when it was recaptured and rereleased during banding operations in Washington.