Calliope hummingbirds are a migratory bird, generally leaving their breeding grounds earlier than most birds (although not as early as the rufous hummingbird) to take advantage of the late-summer wildflowers in the mountains of western North America.
They are believed to be the smallest-bodied long distance migrant in the world.

These birds feed on nectar from flowers using a long extendable tongue, drink sap from holes created by sapsuckers or catch insects on the wing.
While collecting nectar, they also assist in plant pollination.
Plants preferred for pollinating include paintbrush, penstemon, columbine, trumpet gilia, and elephant head.
They will also occasionally catch and eat small insects and spiders.

Adult males usually arrive on the breeding ground before females, from mid-April to early May. The male claims and vigorously defends a nesting territory in which he will breed with many females.
The male takes no part in raising the young and often actually vacates the breeding grounds by the time the young hatch.
The female usually builds an open cup nest in a conifer tree under an overhanging branch, though apple and alder trees have also been used.
The nest is often built on the base of large pine cones and somewhat resembles a pine cone itself.
A nest may be used repeatedly over the course of several years.
Two eggs are laid from late May to early July and are incubated for 15 to 16 days.
The young are capable of flight about 20 days after hatching.
Calliope hummingbirds are a migratory bird, generally leaving their breeding grounds earlier than most birds (although not as early as the rufous hummingbird) to take advantage of the late-summer wildflowers in the mountains of western North America. They are believed to be the smallest-bodied long distance migrant in the world.
These birds feed on nectar from flowers using a long extendable tongue, drink sap from holes created by sapsuckers or catch insects on the wing. While collecting nectar, they also assist in plant pollination. Plants preferred for pollinating include paintbrush, penstemon, columbine, trumpet gilia, and elephant head. They will also occasionally catch and eat small insects and spiders.
Adult males usually arrive on the breeding ground before females, from mid-April to early May. The male claims and vigorously defends a nesting territory in which he will breed with many females. The male takes no part in raising the young and often actually vacates the breeding grounds by the time the young hatch. The female usually builds an open cup nest in a conifer tree under an overhanging branch, though apple and alder trees have also been used. The nest is often built on the base of large pine cones and somewhat resembles a pine cone itself. A nest may be used repeatedly over the course of several years. Two eggs are laid from late May to early July and are incubated for 15 to 16 days. The young are capable of flight about 20 days after hatching.
Calliope hummingbird