Natural History: Heermann's Gull feeds on marine fishes, invertebrates, and scavenges material along shorelines, beaches, and offshore kelp beds. It breeds off the Mexican Coast.
General Distribution: In the Presidio, this species can be found in the ocean, bays, tidal sand areas, areas of tidal rock, and around piers and pilings.
Frequency: This species is common in summer, fall, and winter but uncommon during the spring.
Identifying Characteristics: Heermann's Gull can be noted by its dark gray color with a black tail, whitish head, and red bill.