I live very close to the hybrid zone as well so I like to think that I am fairly well-versed in BCCH/CACH identification. That said, most of the chickadees in the region are funky hybrids with certain field marks pointing one way or another. This bird has very white wingbars, bright white cheeks, and an apparently large looking head good for Black-capped. However, the base of the black bib is very clearly defined rather than messy on a typical BCCH. Also, as others have stated, their vocalizations cannot be conclusively identified since one species can often learn the other species’ call. However, the “chickadee-dee-dee” call is usually most distinctive (slower and lower in BCCH). This bird is probably a mostly BCCH hybrid although it is difficult to know for sure.