Small gray birds on Colorado front range, June (1 Viewer)

Can you help me ID this small perching bird? Four or five of them flew together into the branches of a cedar tree in the evening shadows. Barely larger than a hummingbird. Gray overall, lighter (possibly white) belly. I had the impression of a darker streak on (some?) heads, whether cap or mask hard to say in poor light.

I've considered blue-gray gnatcatcher (most likely geographically, but no cap/mask?), black-tailed gnatcatcher (nice cap but unlikely in Colorado), and bushtit (no cap/mask, and brownish vs gray). Nothing I'd feel confident of. Also, these seem rather plump while I had the impression of a more slender, elongated body... perhaps because they were moving around rather than just perching? Thanks.

Have you checked photos of a Bushtit? They are very small, usually in flocks, and gray.

Lisa W said:

Have you checked photos of a Bushtit? They are very small, usually in flocks, and gray.

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Bushtit would be my guess also. With regard to head/face markings, some Bushtits in interior US have black “ear” patches developed to varying extents.

Thanks. The flocking does fit with Bushtits... I'll hope to get a better look at them sometime soon.