Tricolored Bat
Perimyotis subflavus
The tricolored bat or American perimyotis is a species of microbat native to eastern North America. Formerly known as the eastern pipistrelle, based on the incorrect belief that it was closely related to European Pipistrellus species, the closest known relative of the tricolored bat is now recognized as the canyon bat. Its common name "tricolored bat" derives from the coloration of the hairs on its back, which have three distinct color bands. It is the smallest bat species in the eastern and midwestern US, with individuals weighing only 4.6–7.9 g (0.16–0.28 oz). This species mates in the fall before hibernation, though due to sperm storage, females do not become pregnant until the spring. Young are born helpless, though rapidly develop, flying and foraging for themselves by four weeks old. It has a relatively long lifespan, and can live nearly fifteen years. Source
Where is the Tricolored Bat now?
In the last 8 weeks this bat was recorded 4,649 times across 21 areas (each area is a 5 degree square).
See the Tricolored Bat on the live map
When does the Tricolored Bat arrive?
The week it was first heard regularly in each region, after at least six weeks away. Dates differ from south to north, so a region has a range.
| Region | First arrival | Last arrival | Typical peak | Areas |
|---|---|---|---|---|
| North America | 7 September 2026 | 5 October 2026 | 5 October 2026 | 4 |
Arriving at the same time in North America
- Golden-crowned Kinglet Regulus satrapa
- Dark-eyed Junco Junco hyemalis
- Gadwall Mareca strepera
- Tundra Swan Cygnus columbianus
- Trumpeter Swan Cygnus buccinator
- Snow Goose Anser caerulescens
- American Tree Sparrow Spizelloides arborea
- Common Redpoll Acanthis flammea
Every arrival in North America, month by month
Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.