I concur with Tina Mitchell: Young black-headed grosbeaks in my neck of the woods make the same calls when begging to be fed. It's a plaintive, descending sound, often as a single note but usually followed by one or two quicker ascending calls and resolving on that descending note. It's like a wolf whistle, but sung sad with a one-note intro. Listen a few minutes, and the telltale squeaky "chip" of an adult arriving usually follows.
I have been watching five or six juveniles in my backyard do this over the past few weeks. Until Mike's recording, I hadn't heard this call for the species on various online guides.
John Ealy
Roxborough Park, Douglas County CO
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