The Calliope Hummingbird

The Calliope Hummingbird is one of the most fascinating species in North America, and its migration is nothing short of astonishing.

 

Calliope Hummingbird (Selasphorus calliope) 

The smallest bird in the United States and Canada — only about 3 inches long and 2–3 grams. Yet it performs one of the longest migrations of any hummingbird relative to body size.

 

Where It Breeds

Calliopes breed in:

- The Pacific Northwest

- British Columbia

- Alberta

- Idaho

- Montana

- Wyoming

- High-elevation meadows in the Rockies

 

They prefer cool, open mountain habitats with scattered shrubs and wildflowers.

Where It Winters

Calliope Hummingbirds winter deep in western Mexico, primarily:

- Jalisco

- Colima

- Michoacán

- Guerrero

 

They favor pine-oak forests and shrubby habitats at mid‑elevations.

 

This means they migrate 2,500–5,000 miles round‑trip, depending on breeding location — an incredible journey for a bird that weighs less than a penny.

 

Migration Route

Their migration is a loop:

 

Spring (northbound)

- Moves north through the Pacific Coast and Great Basin

- Arrives in the Northwest and Rockies by late April–May

 

Fall (southbound)

- Takes an inland Rocky Mountain route

- Travels down through Idaho, Utah, Colorado, New Mexico

- Crosses into Mexico for winter

 

This loop migration helps them follow blooming wildflowers and avoid competition with larger hummingbirds.

 

Does the Calliope Hummingbird Hybridize?

Hybridization is rare, but it does happen.

 

Documented hybrids include:

- Calliope × Broad-tailed

- Calliope × Rufous

- Calliope × Black-chinned (very rare)

 

Why it’s uncommon:

- Calliopes breed at higher elevations than most other species 

- Their courtship behavior is very species‑specific 

- Their size difference makes pairing with larger species less likely 

 

But hummingbirds are notorious for occasional hybridization, so it’s not impossible.

 

Is the Calliope Hummingbird in Decline?

Unfortunately, yes — the species is declining.

 

Population trend

- Down roughly 30% since the 1970s

- Considered a Species of Concern by several conservation groups

 

Main threats

- Habitat loss in Mexican wintering grounds 

- Fire suppression altering mountain meadow breeding habitat 

- Climate change shifting flowering times 

- Competition with larger hummingbirds (especially Anna’s expanding northward)

 

It’s not in crisis like the Rufous or Allen’s, but it’s definitely not thriving.