Bats around Portland
Portland, Oregon, United States
Every measure here is worked out per 5 degree square, so this covers the wider area around Portland (45° to 50° latitude, -125° to -120° longitude, about 550 km across), not the city alone. Counts are shares of all bats records in the same weeks, so busier stations do not inflate them (methods).
Arrived in the last four weeks
No bats arrived here in these weeks last year, as far as the records show.
Expected in the next six weeks
No arrivals expected here in the next six weeks, going by last year.
Dates are last year's first regular records after at least six weeks away, with each species' own uncertainty on its page. Each species page can email you when it turns up.
Most recorded, last eight weeks
| Species | Records | Per 1,000 |
|---|---|---|
| California Bat Myotis californicus | 10,058 | 200.5 |
| Big Brown Bat Eptesicus fuscus | 3,623 | 72.2 |
| Little Brown Bat Myotis lucifugus | 3,248 | 64.7 |
| Western Long-eared Bat Myotis evotis | 404 | 8.1 |
| Silver-haired Bat Lasionycteris noctivagans | 105 | 2.1 |
| Townsends Big-eared Bat Corynorhinus townsendii | 66 | 1.3 |
| Western Red Bat Lasiurus blossevillii | 53 | 1.1 |
| Hoary Bat Lasiurus cinereus | 23 | 0.5 |
| Pallid Bat Antrozous pallidus | 4 | 0.1 |
How well this area is covered
Watched in 12 of the last 12 weeks for bats (enough records to count; unwatched weeks say nothing about absence). Active stations here in the last 30 days: 570 BirdWeather, 7 orcasound, 1 acartia. Add a station to fill the gap.