I was at Bolsa Chica today when I heard this rather funny loud rhythmic chattering/clapping sound. I followed the sound, and I saw this little guy making the sound. S/he came out of the mangroves, played in the water for a few seconds, and then headed back in. I had no idea what kind of a bird it was, but luckily there was another person there with binocular who identified the bird for me. He seemed extremely excited as he told me that he has been birding for 40+ years and while he thought he had heard the sound a few times in the past, this was apparently the first time he was actually able to see this bird! Apparently it is a near-threatened species of bird...

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Nikon D5, 600mm f/4E on monopod, f/4, 1/2500 sec, ISO 3200, SB-910 flash on bracket, taken about 40 mins before sunset on today's cloudy day,