Recently, every evening at twilight, a succession of seagull-sized birds have taken to flying westward over our house, emitting laconic "wok wok" sounds. For awhile, we didn't have any idea what kind of birds they were. It didn't click for me until the other night, when we walked past a nearby field attached to a local school. As we approached, I remembered that we used to see Black-crowned Night-Herons standing on the grass there, no doubt finding yummy things to eat in the turf. Sure enough, there was one there, and as we watched, it flew off. It had the same pale belly as the wok wok birds, so when we got home, I did a quick bit of internet research, and sure enough, Black-crowned Night-Herons go "wok wok". Mystery solved.
Here's the link, with sound clips.
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