When a fish was sighted in a wave returning to the ocean, the Black-crowned Night Herons
ran down the sand toward the water and usually caught the fish before it washed away into deeper water.
Each of the four interns gathered data for long-standing projects, such monitoring the presence of black-crowned night herons
, but also created their own projects that they worked on throughout the summer.
The birds used a great deal of aggression when encountering other Black-crowned Night Herons
within close range either at the water's edge or at the top of the bank where passers-by distributed bread.
In addition, the black-crowned night heron
and blackpoll warbler, both species of special concern for some time, have been added to the state endangered species list.
According to Daphne Hatch, the park's wildlife biologist, in 1998 Alcatraz provided sanctuary for about 240 Black-Crowned Night Heron
and 15 Snowy Egret nests (up from just three the previous year).
The situation is perhaps unique in that human depredation is not a major cause: Spendelow blames a small colony of black-crowned night herons
, which eat tern eggs.
The Venice Area Audubon Rookery, mentioned earlier, attracts a variety of birds, including great blue herons, great egrets, snowy egrets, cattle egrets, anhingas, gallinules and yellow-crowned night herons
Yellow-crowned night herons
roost in the willows near die parking lot.
An onshore observation point provides a unique setting to witness the nesting habits of the resident cormorants, black-crowned night herons
and great blue herons, the latter of which make nearby Fairbank Point their largest coastal rookery between San Francisco and Mexico.
Note that the new trail is open only from mid-September through January, after which it's closed to permit nesting of Western gulls, cormorants, and black-crowned night herons
Included in this revision are incorporating the night herons
in subfamily Ardeinae together with the typical day herons and egrets.
It also has the distinction of being the only colony in the Commonwealth where black-crowned night herons
, yellow- crowned night herons
and great egrets nest together.