Insights: Migration

Seasonal trends and migration tracking.
In plain English
  • 20 species arrived in the last two weeks after being absent — most recently Downy Woodpecker.
  • 30-day diversity is Low (Shannon index 0.908), up 20 species compared with this month last year.

🦅 Migration & Seasonal Patterns

🆕 New Arrivals (Last 14 Days) iSpecies appearing in the last 14 days that were absent for the previous 2 weeks. Useful for tracking return migration.
Downy Woodpecker
First seen: Oct 6
5 detections
Red-breasted Nuthatch
First seen: Oct 6
2 detections
Great Horned Owl
First seen: Oct 4
3 detections
Steller's Jay
First seen: Oct 4
1 detections
Mountain Chickadee
First seen: Oct 4
2 detections
American Tree Sparrow
First seen: Oct 4
30 detections
Canada Goose
First seen: Oct 3
1 detections
Northern Flicker
First seen: Oct 3
32 detections
Rock Pigeon
First seen: Oct 3
1 detections
Blue Jay
First seen: Oct 3
11 detections
Dark-eyed Junco
First seen: Oct 3
29 detections
Pygmy Nuthatch
First seen: Oct 3
1 detections
Green-winged Teal
First seen: Oct 2
1 detections
American Crow
First seen: Oct 2
6 detections
House Sparrow
First seen: Oct 2
22 detections
Black-billed Magpie
First seen: Oct 2
2 detections
Eurasian Collared-Dove
First seen: Oct 2
1 detections
Common Raven
First seen: Oct 1
1 detections
House Finch
First seen: Oct 1
879 detections
Black-capped Chickadee
First seen: Oct 1
61 detections
🔇 Gone Quiet iRegular residents that haven't been detected in at least 14 days. This may indicate they have migrated away or changed territories.
All regular species still active! ✓
📅 Year-over-Year Arrival Comparison (2025 vs 2026) iTracking if migratory species arrived earlier or later than they did in the previous calendar year.
Not enough multi-year data yet —
🗓️ Seasonal Presence iClassification Guide:
• Year-round: Detected across 9+ months
• Seasonal: Detected across 3-8 months
• Transient: Detected <3 months

Data Accuracy Disclaimer:
These classifications may be inaccurate if the station has been running for less than a full year, as it lacks seasonal historical context.

Bar height is expected frequency. Purple highlights are actual detections.
House Finch
879 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Black-capped Chickadee
61 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Northern Flicker
32 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
American Tree Sparrow
30 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Dark-eyed Junco
29 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
House Sparrow
22 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Blue Jay
11 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
American Crow
6 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Downy Woodpecker
5 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Great Horned Owl
3 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Black-billed Magpie
2 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Mountain Chickadee
2 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Red-breasted Nuthatch
2 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Canada Goose
1 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Common Raven
1 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Eurasian Collared-Dove
1 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Green-winged Teal
1 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Pygmy Nuthatch
1 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Rock Pigeon
1 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D
Steller's Jay
1 detections Transient
J
F
M
A
M
J
J
A
S
O
N
D