Image of volunteer using a bat detector

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:

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.
Within Group Classification
symbol for high frequency group High Frequency Group (HFG) includes:
symbol for myotis, undifferentiated Myotis
symbol for Little brown myotis MYLU = Myotis lucifugus [Little brown myotis]
symbol for Northern long-eared myotis MYSE = Myotis septentrionalis [Northern long-eared myotis]
symbol for Labo/Pesu, undifferentiated Labo / Pesu
symbol for Eastern red bat LABO = Lasiurus borealis [Eastern red bat]
symbol for Tricolored bat PESU = Perimyotis {=pipistrellus} subflavus [Tricolored bat] (formerly Eastern pipistrelle)
symbol for low frequency group Low Frequency Group (LFG) includes:
symbol for hoary bat LACI = Lasiurus cinereus [Hoary bat]
symbol for EPFU/LANO, undifferentiated Epfu / Lano
symbol for Big brown bat EPFU = Eptesicus fuscus [Big brown bat]
symbol for silver-haired bat LANO = Lasionycteris noctivagans [Silver-haired bat]
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