close-up of the seagull sitting by the bay at pier and looking at the sea at san francisco, usa

america animals avian bay beak bill billed birding birds birdwatching black blue dock family fauna feathers feeding flight flying fowl francisco gray grey gull gulls nature north ornighology ornithology outdoors pacific pier plumage ring ringbilled san scavenger sea seabird seagull seagulls shore species spotted usa water white wild wildlife wings yellow zoology