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What was the SIZE of the Black Gull-like bird you saw in California?



Masked Booby: This large seabird has a white body, black trailing edge on the wings, and a pointed black tail. The head has black mask and a long pointed yellow bill. The legs and feet are yellow-gray. It plunge dives from 40 feet for small squid and flying fish. It alternates strong rapid wing beats with glides. Sexes are similar, but the female is larger.
Wilson's Storm Petrel: This small storm-petrel has a brown-black body, pale brown wing bands and a large, white rump. It has a fine black bill with very pronounced tubes. It feeds mainly on pelagic crustaceans and fish. The wings are short and rounded. The feet extend past the tail in flight. It has a direct flight with steady, shallow wing beats. The sexes are similar in size and coloration.
Sooty Tern: This medium-sized tern has long wings, a deeply forked tail, black crown, nape, and upperparts and a broad triangular white forehead patch. The underparts are white; upper tail is black with white outer edges. It has a direct flight with strong, shallow wing beats. It hovers before dipping for prey. It feeds on squid and fish. Sexes are similar.
Parkinson's Petrel: Medium to large seabird with overall black or dark brown plumage. It has a yellow-white bill with a black tip, black legs and feet, and a medium length tail. Has powerful flight with slow flapping followed by long glides on long wings.
White-chinned Petrel: Medium to large seabird with overall black or dark brown plumage. It has a chalky white bill, black legs and feet, and a medium length tail. It often shows a silvery patch on the base of the primaries of its long wings. Flight is powerful with slow wing beats and long glides.
 
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