"Dull pink in all plummages"

Adult Herring Gull still in alternate plumage with two late cormorants

Dunno about you, but I'm having trouble with the "dull" modifying the "pink" when it comes to those feet.

Also, that's a pretty good illustration that Herring Gulls are honking big; it looks larger than the double-crested cormorant.  (They're not; Herring Gulls mass 800-1200 grammes, where Double-crested Cormorant masses 1200-2500 grammes.  Posture and glowing white plumage affect perception.)