Acoustic Survey of Bats in Ambleside Park

Acoustic Survey of Bats in Ambleside Park

Submitted by John Martin

Survey Date: July 29 2022; Revised: August 01 2022

Disclaimer: Due to the potential overlap and limitations in auto-id software, the listed species detected during this survey may not be fully accurate. For more accurate identification, the bat calls should be analyzed using more sophisticated bat acoustic software.

Detection Survey Information

Type of Detection Survey: Bat Survey

Survey Site: South side of Ambleside Pond from the west bend towards the east end of the pond.

Recording Device: Echo Touch 2 Bat Detector + Android Pixel 6 phone

Detection Device Operated by: John Martin; Observers: John Martin


Sunset Time: 8:56 PM; Temperature: 23o (Celsius)

Weather: E.G. Relatively clear conditions (<5% cloud) with light wind: 7 km/h

Session Recording Start Time: 9:35 PM; Session Recording End Time: 10:46 PM

First Bat Call: 9:36 PM – TADBRA – Mexican Free-tailed

First Bat Call Emerging from Bat Box: n/a

First Myotis Foraging Bat Call: 9:42 PM – MYOLUC – Little Brown Myotis

Last Bat Call Prior to Recording Stopped: 10:45 PM – PARHES – Canyon bat

Duration of Calls (Minutes): 69; Frequency of Calls (Calls per minute): 2.01

Summary of Bat Calls Detected (Primary ID)*

Primary Bat Call ID*Number of Calls**Call %Secondary Call ID
MYOLUC – Little Brown Myotis6849%MYOVOL – Long-legged Myotis
MYOVOL – Long-legged Myotis4432%MYOLUC – Little Brown Myotis
MYOYUM – Yuma Myotis2317%MYOVOL – Long-legged Myotis
TADBRA – Mexican Free-tailed32%LASCIN – Hoary Bat
PARHES – Parastrellus hesperus11%LASBOR – Lasiurus borealis
Primary Bat Call ID*139100% 
Number of Bat Species Detected5


* Several results of the bat call auto-identifications for this session are uncertain and suspect.  Verification of these results should be done with the use of more advanced bat acoustic software.

** The number of bat detection calls does not reflect the number of different bats, as the same bat may make several calls within range of the bat detector, particularly if bats are foraging at a site


1) Re TADBRA, while there have been some unconfirmed recordings in BC, it is believed that few if any visual sightings of this bat species occur here and it is more likely a Hoary bat call that was misidentified. Verification would require a experienced bat specialist in using acoustic software run it through a program and manually examine the call.                              

2) Re PARHES, the Canyon bat is a mystery since this speices normally is found in the south Okanagan region. This is a warm weather bat not normally detected in Metro Vancouver. Further analysis by an experienced bat specialist in using acoustic software is recommended to verify.

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