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Western Gull - Larus occidentalis
First-years

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Western Gull, 1st winter: Roberts Lake Park, Monterey, California, USA - 11th March 2007
As can be seen from this and following images first year Western Gulls are overall a very dark slaty-brown colour, plain faced, blotched rather than streaked, short-winged and have prominent Gonydeal Angles.
Western Gull, 1st winter: Roberts Lake Park, Monterey, California, USA - 11th March 2007
A more 'grey' bird than the previous individual remains dark overall. Note the very deep and blunt tipped bill and the scapular pattern. The dark brown tertials have pale tips though wear is evident on most feather tracts.
Western Gull, 1st winter: Roberts Lake Park, Monterey, California, USA - 11th March 2007
The scapulars are not edge pale greyish-white on this bird but appear more solidly dark brown/slate coloured. The overall impressions is of a fairly uniform grey-brown bird with short primaries and blank expression. The tertials are plain whilst the wing coverts lack much discernable patterning. Here, as was often seen on main Western Gulls, the Secondaries are clearly visible with the narrow white trailing edge.
Western Gull, 1st winter: Roberts Lake Park, Monterey, California, USA - 11th March 2007
A paler bird in appearance which is due to the faded/bleached wing coverts. The wing coverts lack much patterning whilst the secondaries are exposed and the tertials are plain. The short wings are evident. Note also the grey/brown mottled underparts, paler breast and head which contrasts with the darker brown hind-neck.
Western Gull, 1st winter: Roberts Lake Park, Monterey, California, USA - 11th March 2007
The above and below highlight the variability of these birds: the above bird has a darker mottled grey head, neck and breast with whiter belly and vent. The tertials show a large whitish tip.  The bird below is a fairly pale individual but retains a blotched grey plumage and as with the bird above a bulbous tipped bill.
Western Gulls, 1st winter: Roberts Lake Park, Monterey, California, USA - 11th March 2007
On the following four images note the general overall structure, plumage tones and the huge blunt tipped bill. Note on the first bird the wing coverts are quite well defined and the bird has a rather upright posture, large eye, slightly pallid tones and obvious barred under-tail coverts. This could be be due to wear and fading but some hybrid influence is at work.