Adult male: rose (fresh ... twitters distinct from Anna’s. Costa’s generally plainer on throat and underparts, without dusky throat spotting. See black-chinned hummingbird.

Inside that tunnel sits a male Anna’s hummingbird, watched from above by a panopticon of eight cameras. An Anna’s hummingbird hovers inside a special chamber at Stanford University that can ...

The male Allen’s hummingbird has warm rusty ... chip notes and aggressive rattling sounds used in confrontational situations.