A stocky, football-shaped seabird with a very short neck, a large head, and an enormous bill (especially during the breeding season) that is tall and laterally flattened.
Relative Size
Larger than a Pigeon Guillemot, smaller than a Common Murre.
![Relative Size](/guide/images/size/scale.png)
![crow sized](/guide/images/size/crow-sized.png)
Measurements- Both Sexes
- Weight: 17.0-22.9 oz (483-648 g)
- Weight: 17.0-22.9 oz (483-648 g)