Antics of a juvenile Black-crowned Night Heron

posted in: Heron-Egret-Bittern, Nesting | 4

“Long before the arrival of the nesting Grey Herons (Ardea cinerea) in Sungei Tampines heronry, Striated Herons (Butorides striatus) and Black-crowned Night Herons (Nycticorax nycticorax) had already been making use of the place as their home. This has been their roosting and nesting ground for many years. Unlike the exposed nests of the Grey Herons, these smaller herons’ nests were well hidden deep inside the dense mangrove foliage and difficult to view. Nevertheless, breeding of these species could be confirmed as their young had been observed begging to be fed when they wandered into the open.

“While observing the nesting of Grey Herons, there were sporadic opportunities to observe the smaller herons, which would come into view on some occasions. During one such encounter, a juvenile Black-crowned Night Heron was observed to be perched on an exposed branch over water. The juvenile looked comical as it looked high and low, as if searching for something (above left). Unexpectedly, it lost its balance. It had probably over-stretched itself while standing upright and looking up. It had to out-stretch its wings to maintain balance (above right). After regaining its composure for a short moment, its antics continued as it stumbled again. It had to perform another balancing act by alternating between raising its left and right wings.

“What was the juvenile trying to do? The mystery was unraveled when it moved a few steps up the slightly sloping branch, stopped and extended its neck. With one sudden rapid thrust of its bill, it broke of f a near vertical stem and held it in its beak (above). It then flew off with the stick into the dense mangrove foliage. Obviously, this juvenile heron was on the lookout for suitable nesting material and had found the stick it wanted.

“Correct me if I am wrong. Judging from its juvenal plumage and orange eyes, this juvenile Black-crowned Night Heron was probably about one year old. It was indeed strange that such a young juvenile could be acquiring nesting material. Could this juvenile be learning nest building in preparation for its adulthood? Or could it be practising cooperative breeding where the young assist the adults in nest building?”

Kwong Wai Chong
Singapore
21st January 2011

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4 Responses

  1. Definitely nesting behavior. Agree with you that possible practice” behavior for adulthood.
    Amar

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  2. Spotted a Nycticorax nycticorax standing motionless in the dark on the cow grass field beside Jurong East MRT Station on 08 Mar 2011 night (10pm). From the black-&-white plumage, red eyes & brownish legs, it appeared to be a non-breeding adult.

    Although the bird was barely 3m away from the almost continuous flow of commuters walking along the adjacent walkway, it stood its ground (probably because no one was paying it any attention), & flew away only when approached within 2m for photo-taking.

    According to the S’pore Red Data Book (2008), this species is listed as nationally critically-endangered. May I know which CR category does it fall under ? Less than 50 mature individuals ?

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    • Now who actually knows?

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      • No one knows the definition of the CR category ?

        Anyway, since Nycticorax nycticorax is “critically endangered” as a species in Singapore, just thought that I would report another sighting of an adult on 23 Apr 11 (around 1.15am) at Pandan Reservoir. It was standing amongst some vegetation near the fishing deck, & I caught sight of the stocky creature as it took off into the night upon hearing my footsteps.

        Perhaps the 08 Mar 11 & 23 Apr 11 birds are from the Jurong Lake colony.

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