| Species | Age group | Length in inches |
| Bonaparte's | Adult | 13.5000 |
| Mew | Adult | 16.0000 |
| Black-legged Kittiwake | Adult | 17.0000 |
| Ring-billed | Adult | 17.5000 |
| Heermann's | Adult | 19.0000 |
| California | Adult | 21.0000 |
| Thayer's | Adult | 23.0000 |
| Herring | Adult | 25.0000 |
| Slaty-backed | Adult | 25.0000 |
| Western | Adult | 25.0000 |
| Glaucous-winged | Adult | 26.0000 |
| Glaucous-winged-Western Hybrid | Adult | 26.0000 |
| Glaucous | Adult | 27.0000 |