[Prob Black-chinned ] Hummingbird at Bentsen Palm Village RV Park in Mission,TX

[[POST NOTE: I have requested and received feedback from several members of the Texbird listserve, including those with considerable experience and expertise, that all agreed this is not an Ann's Hummingbird. They all also agreed that it is, or it is suggestive of, a Black-chinned Hummingbird.]
I videotaped this female/immature hummingbird in the Bentsen Palm RV Park in Mission,TX feeding in the same coral bean tree as the Black-vented Oriole (and while that rare vagrant was off somewhere else). Another birder said he believed this was an immature Anna's Hummingbird which would also be fairly rare for this area in the winter. Unfortunately I have very limited experience with Anna's Hummingbirds, including none with females and immatures. This bird looks more like a immature Black-chinned but I thought I should put this and more video clips up for feedback by those familiar with Anna's. SeEtta