Birds of the Sanctuary: Brown-Headed Cowbird
Note that this may or may not be a Brown-Headed Cowbird, but it's the closest match I could find; its slightly olive tinge may be a result of lighting conditions. A smaller member of the Blackbird family, which includes Grackles, this bird is easily missed owing to good camouflage as it feeds from the ground. I've only spotted a few of them.
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