Hummingbird ID? - Wild in San Diego Zoo Safari Park

Not an expert but I'd put my money on it being either a Black-chinned hummingbird, Archilochus alexandri or Costa's hummingbird, Calypte costae, but as the females of these species look virtually identical, I can't narrow it down from there.

Looks like juvenile Anna's to me.

It's definitely one of the Calypte species, either Anna's or Costa's. I'm leaning towards Anna's. This is not a Black-chinned Hummingbird.

@birdsandbats Can I ask why? Too rounded? Just for future reference .