Natural History: This bird forages for fish, mostly by diving and being able to stay underwater for about 30 seconds. It tends to rest and roost on offshore cliffs and on rocks, wharfs, and branches. It sometimes rests on water. Its takeoff is quite laborious. The nests are quite sensitive to disturbance and are found on rocky cliffs, slopes, and tall trees. Breeding season runs from April to August. This species is monogamous by nature and nests colonially.
General Distribution: In the Presidio, this species can be found in bays, the ocean, ponds, and tidal rocky areas.
Frequency: The Double-crested Cormorant is common throughout the year within the Presidio.
Identifying Characteristics: This bird has the tendency to be an upright percher with a S-shaped neck and hook-tipped bill. Unlike its relative, the Brandt's Cormorant, this species displays an orange-yellow throat pouch. These birds tend to cluster in silent flocks, forming in geese-like patterns.
Did You Know?
The entire Presidio has been designated a National Historic Landmark. Of the 870 structures on the former post, 470 are considered to have historical significance.