Black-chinned Hummingbird

The hybrid between the black-chinned hummingbird and Anna's hummingbird is called "Trochilus" violajugulum. The black-chinned hummingbird is also known to hybridize with Anna's,

This species has been labeled as a least-concern species because of its broad range (), considerable population size and growth (14.6% increase per decade).

The vocalization of the black-chinned hummingbird is a rapid, high-pitched chirp.

Black-chinned hummingbirds are found in most of the western United States, reaching north into British Columbia, east to Oklahoma, and as far south as Mexico. The males and females of this species use different habitats from one another for breeding territories.

=== Breeding === This species uses diving displays ( dives) for territory defense and during courtship, producing an audible sound (a trill) as air passes through their feathers during the plunge. Black-chinned hummingbirds can exhibit territorial behavior around feeders as well as at other small feeding sites, becoming more defensive during breeding season. However, if there are numerous individuals in an area as well as multiple food sources, this species shows less territoriality.

These birds feed on nectar from flowers using a long extendable tongue or catch insects on the wing. While collecting nectar, they also assist in plant pollination.

The female builds a well-camouflaged nest in a protected location in a shrub or tree using plant fibers, spider web silk, downy feathers and lichens. Black-chinned hummingbirds prefer to nest above the ground, often on exposed horizontal branches below the canopy. Research also suggests that they may purposefully nest near the active nests of larger, predatory birds, as a means of reducing nest predation; the larger predators do not prey on the hummingbird, but their presence will deter other birds that might be interested in the black-chinned hummingbird's eggs or newly hatched chicks. The female lays two white eggs at a time, each about in diameter, and may breed 2–3 times per year, incubating the eggs for 13–16 days. She feeds the young by inserting her bill deep into their throats and regurgitating insects and nectar. The young fledge at about 20–21 days.