![Image of volunteer using a bat detector](/inventory/bats/volunteer/img/volunteer.jpg)
Acoustic Survey Legend and Results
Select a year from the list on the right to see where surveys have occurred and view the maps showing results from those surveys.
The maps display the route surveyed superimposed on an aerial photograph. Bat encounters along the route are indicated by a symbol that represents the species or group. These symbols are explained below:
![](img/newLegend.jpg)
Species & Groups
General Classification (HFG, LFG)- Characteristic frequency identified near the minimum call frequency.
- High Frequency Group (HFG) and Low Frequency Group (LFG) separated with a cutoff value of 35 kHz.
- HFG and LFG are used if 1) too few calls were recorded to further separate, 2) if calls are of low quality recording (fragmented), 3) bat pass does not contain search-phase calls, or 4) general uncertainty.
![symbol for high frequency group](img/sym_HFG.jpg)
![symbol for myotis, undifferentiated](img/sym_Myotis.png)
![symbol for Little brown myotis](img/sym_MYLU.png)
![symbol for Northern long-eared myotis](img/sym_MYSE.png)
![symbol for Labo/Pesu, undifferentiated](img/sym_LABOPESU.png)
![symbol for Eastern red bat](img/sym_LABO.png)
![symbol for Tricolored bat](img/sym_PESU.png)
![symbol for low frequency group](img/sym_LFG.jpg)
![symbol for hoary bat](img/sym_LACI.png)
![symbol for EPFU/LANO, undifferentiated](img/sym_EPFULANO.png)
![symbol for Big brown bat](img/sym_EPFU.png)
![symbol for silver-haired bat](img/sym_LANO.png)
Notes
- Currently, some species are grouped together to prevent misidentification (e.g. EPFU and LANO, and the Myotis species) due to similarities between calls.
- As additional reference calls / passes from species of known individuals (identified in hand after capture and recorded upon release) are added to the reference library we will further distinguish within each species group.
![DNR logo](/xtras/img/DNRLogo.png)
This site is produced in conjunction with the Wisconsin Aquatic and Terrestrial Resources Inventory and sponsored by the Wisconsin Department of Natural Resources. The information presented on this site is subject to the Wisconsin Department of Natural Resources' Legal Notices, Disclaimers, and Terms of Use.