Night-heron rookery, National Zoo
National Zoo in Washington DC hosts a fairly sizable and accessible night-heron rookery, with around 100 pairs of Black-crowned Night-heron and 1 pair of Yellow-crowned Night-heron. The birds have been back for a while now, and are well advanced with nest building. Soon the leaves will largely hide the nests, but for now it's still possible to get good views, albeit with a few twigs and branches cutting across the frame.
The rookery is near the Bird House, with most of the nests in the trees at the back of a series of enclosures that house White Stork, Blue Crane, Whooping Crane and Kori Bustard (if memory serves!).
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