Double-crested Cormorant (Phalacrocorax auritus) Science Article 2
In the early 1970s, censuses of Double-crested Cormorants Phalacrocorax auritus albociliatus on Isla Alcatraz in the Gulf of California suggested that Isla Alcatraz was one of the largest Double-crested Cormorant nesting colonies in the Gulf. To update information on the size of the colony, we counted active nests at Isla Alcatraz during the 2000/01, 2001/02, and 2002/03 seasons. Nesting began in September and continued through April. Peak nesting activity in 2000/01 was in early January, with 1225 active nests.
TAD PFISTER et al., Marine Ornithology 33: 195-197 (2005)