To spot a Costa's hummingbird, you have to know what they look like. Females are hard to identify compared to other ...

Half of the species of Hummingbirds of Costa Rica assembled with direct sounds, comments on varied features of the birds, leading to their identification, enjoyable entertainment, and educational ...

Costa’s generally plainer on throat and underparts, without dusky throat spotting. See black-chinned hummingbird.

An acoustic camera image shows how Costa's hummingbirds dive to the side of a caged female to minimize an audible Doppler sound. The color represents loudness. Disclaimer: AAAS and EurekAlert!