These presumed definitive alternate Cantabrican Gulls (Larus michahellis lusitanius) are by Dick
Newell, who says: "Adults: relative to michahellis
in the Mediterranean, Cantabrican Gull is, on average, "cuter",
slimmer, shorter legged and possibly slightly paler. Relative
to argenteus it has a long rear attenuation, bright yellow
legs, red eye-ring, is possibly slightly darker and has a similar
wing-tip pattern to michahellis. Relative to graellsii
and intermedius (direct comparisons), usually slightly
larger. A large calling flock sounds like a mixture of graellsii
and argenteus - both lower and higher pitched calls.":
Dick's comment: "adult Cantabrican Gull. In the field, this
bird's legs were obviously yellow, but with pinkish webs.":
