Re: [cobirds] Black-crowned Night Heron seen floating on water, Wash Park, Denver. Who knew?

Were they uncomfortable with the depth of the water or the sudden realization of the company they were keeping? Deb Carstensen, Littleton 

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On Sep 9, 2014, at 9:33 PM, Nick Komar <quetzal65@comcast.net> wrote:

I did observe an entire flock of white-faced ibis (same order as night-herons: Ciconiiformes) land in the center of a deep lake, joining a communal roost of gulls. They seemed very uncomfortable and almost immediately took off again. 

Nick Komar

Fort Collins CO

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On Sep 7, 2014, at 12:53 PM, Joe Roller <jroller9@gmail.com> wrote:

 I have been stopping by Grasmere Lake, the southern water body in Washington Park, at Downing and Louisiana, almost daily for a couple of weeks, counting American White Pelicans as their numbers grow - from 4 to 21, now plateauing around 19-21.

While there this morning I saw an adult Black-crowned Night Heron (hereafter BCNH) floating on the water!

It took me a while to figure out what family this bird was in, let alone species. It was somewhat loon-like, but the thick dagger bill, black crown and gray wings convinced me otherwise. The body was held horizontally, the bill parallel to the water.  I watched it for a minute, as it floated, not fishing or swimming. I ran around the south end to get a better look, and by that time it had resumed its normal vertical or hunched position on branches at the water's edge near it's 3 or 4 off-spring. I looked it up:

This from the Florida Natualist, Fall, 1973, James Kushlan:

Five feeding methods have been previously described for the species: 

Stand and Wait* &

Walk Slowly being the most common; 

Bill-vibrating, standing in shallow water while rapidly vibrating the bill at the surface, (Stone, 1937; Drinkwater, 1958); 

Hovering, flying in place above the surface and catching prey without settling into the water (Meyerriecks. 1960); and 

 Swimming- feeding, alighting on the water and catching prey while afloat (Wetmore, 1920). 

In this article, Kushlan describes "plunge-diving" from the air as a 6th feeding behavior.

Has anyone observed the floating or swimming behavior of Night-Herons?

Intriguing,  I thought.

* Milton - "They also serve who only stand and wait." 

Joe Roller,

Denver

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