Fantastic Audubon Society Overview: https://www.audubon.org/field-guide/bird/broad-tailed-hummingbird
The metallic wing-trill of the male Broad-tailed Hummingbird is a characteristic sound of summer in the mountain west. This sound is often heard as a flying bird zings past unseen. The birds are seen easily enough, however, at masses of flowers in the high meadows, where they hover and dart around the blossoms, often fighting and chasing each other away from choice patches.
Broad-tailed Hummingbird
Broad-tailed Hummingbirds breed in high-elevation meadows, shrubby habitats near pine-oak and evergreen forests, and forest openings within pinyon-juniper, oak woodlands, and evergreen forests in the western United States.
Male defends territory by perching high, scanning for and then chasing intruders. In courtship display, male repeatedly climbs high in the air (up to 60 feet) and then dives, with a loud wing-trill. Nest site is in a tree, on a near-horizontal twig or branch, typically sheltered from above by an overhanging branch. Usually 4-20 feet above the ground, sometimes higher. Nest (built by female) is a neatly constructed cup of spider and plant down, with the outer edge covered with lichen, moss, bits of bark.