Cassin's Vireo
Cassin's VireoCassin's VireoCassin's VireoCassin's Vireo

Cassin's Vireo

Vireo cassinii

Least ConcernNear ThreatenedVulnerableEndangeredCritically Endangered Endemic
Insufficient data
overall probability at Reserva de la Biosfera Mariposa Monarca
2 Verified records at Reserva de la Biosfera Mariposa Monarca
☀️ Diurnal When it's active during daytime hours (6am–6pm)

Cassin's vireo (Vireo cassinii) is a small North American songbird, ranging from southern British Columbia in Canada through the western coastal states of the United States, including California, Oregon, and Washington. The Cassin's Vireo moves down Western United States forests in its migration. During its migration in early spring and late fall, it spends the winter in regions from southern Arizona (the Sonoran Desert) to southern Mexico, including parts of Baja California and the Pacific coast of Mexico. Wikipedia →

Closest Relatives at Reserva de la Biosfera Mariposa Monarca

Hutton's Vireo
LC Endemic

Hutton's Vireo

☀️ Diurnal Bird

Vireo huttoni

10–20% · With luck
Warbling Vireo
LC

Warbling Vireo

☀️ Diurnal Bird

Vireo gilvus

10–20% · With luck
Plumbeous Vireo
LC

Plumbeous Vireo

☀️ Diurnal Bird

Vireo plumbeus

<5% · Rare
Chestnut-sided Shrike-Vireo
LC

Chestnut-sided Shrike-Vireo

☀️ Diurnal Bird

Vireolanius melitophrys

5–10% · Rare
Yellow-eyed Junco
LC Endemic

Yellow-eyed Junco

☀️ Diurnal Bird

Junco phaeonotus

70–80% · Very likely
Ruby-crowned Kinglet

Ruby-crowned Kinglet

☀️ Diurnal Bird

Regulus calendula

60–70% · Likely
House Finch
LC Endemic

House Finch

☀️ Diurnal Bird

Haemorhous mexicanus

40–50% · Likely
Slate-throated Redstart
LC

Slate-throated Redstart

☀️ Diurnal Bird

Myioborus miniatus

40–50% · Likely
Yellow-rumped Warbler
LC

Yellow-rumped Warbler

☀️ Diurnal Bird

Setophaga coronata

40–50% · Likely
Townsend's Warbler
LC

Townsend's Warbler

☀️ Diurnal Bird

Setophaga townsendi

40–50% · Likely
Red Warbler
LC Endemic

Red Warbler

🌅 Crepuscular Bird

Cardellina rubra

40–50% · Likely
American Robin
LC Endemic

American Robin

☀️ Diurnal Bird

Turdus migratorius

40–50% · Likely

📅 Monthly Probability

📊

Fewer than 5 records of Cassin's Vireo at Reserva de la Biosfera Mariposa Monarca — not enough to chart months honestly.

☀️ When They're Spotted

Most active during daytime hours (6am–6pm) · across all parks (global)

☀️Diurnal
☀️🌙🌙12am6am12pm6pm12am

Global Distribution

Where this species is recorded worldwide. Restricted to human observations from 2019 onwards — the same kind of record and the same period the probabilities on this page are built from, so collar-tracking studies, camera-trap arrays and museum specimens are excluded. Around Santa Rosa that removes 5,924 GPS fixes from a handful of tagged jaguars.

where this species is recorded (GBIF density — it tracks where observers go, not how likely a sighting is)  ·  parks where it occurs — tap a pin for the sighting probability there

Parks Where Found

# Park Country Probability
1 Yosemite National Park 🇺🇸 United States
20–30%
2 Glacier National Park 🇺🇸 United States
10–20%
3 Jasper National Park 🇨🇦 Canada
5–10%
4 Sequoia and Kings Canyon National Parks 🇺🇸 United States
5–10%
5 Banff National Park 🇨🇦 Canada
5–10%
6 Death Valley National Park 🇺🇸 United States
<5%
7 Zion National Park 🇺🇸 United States
<5%
8 Big Bend National Park 🇺🇸 United States
<5%
9 Great Bear Rainforest 🇨🇦 Canada
<5%
10 Cumbres de Monterrey National Park 🇲🇽 Mexico
<5%
11 Guadalupe Mountains National Park 🇺🇸 United States
<5%
12 Redwood National Park 🇺🇸 United States
<5%
13 Grand Canyon National Park 🇺🇸 United States
<5%
14 Olympic National Park 🇺🇸 United States
<5%
15 Joshua Tree National Park 🇺🇸 United States
<5%
16 Grand Teton National Park 🇺🇸 United States
<5%
17 Rocky Mountain National Park 🇺🇸 United States
<5%
18 Channel Islands National Park 🇺🇸 United States
<5%
19 Reserva de la Biosfera Mariposa Monarca 🇲🇽 Mexico
Insufficient data
20 Yellowstone National Park 🇺🇸 United States
Insufficient data
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