| Species | Age group | Bill |
| Bonaparte's | Adult | Black |
| Heermann's | Adult | Orange, black tip |
| California | Adult | Yellow, black and red dots |
| Ring-billed | Adult | Yellow, black ring |
| Black-legged Kittiwake | Adult | Yellow, plain |
| Mew | Adult | Yellow, plain, small |
| Glaucous | Adult | Yellow, red dot |
| Glaucous-winged | Adult | Yellow, red dot |
| Glaucous-winged-Western Hybrid | Adult | Yellow, red dot |
| Herring | Adult | Yellow, red dot |
| Slaty-backed | Adult | Yellow, red dot |
| Thayer's | Adult | Yellow, red dot |
| Western | Adult | Yellow, red dot, large |