The calls of a Western pipistrelle or canyon bat after being slowed down and having its frequency lowered. Photo by Daniel Neal via Flickr / Creative Commons.

Canyon Bat Calls

The calls of a Mexican free-tailed bat, adjusted for human hearing. Photo by USFWS/Ann Froschauer via Flickr / Creative Commons.

Mexican Free - Tailed Calls

The calls of a Western mastiff bat, recorded in Griffith Park. Photo by Daniel Neal via Flickr / Creative Commons.

Western Mastiff Calls

Hoary bat call recorded in Griffith Park. Photo by Daniel Neal via Flickr / Creative Commons.

Hoary Bat Call

Time Expansion recording from what I think is an Eptesicus serotinus. I could see it hanging from the facade of a large flat. It was hanging on the 10the floor and it has been hanging there for at least 45 minuten. All the four times I visited that site it has been calling like this in a "stationary way. I heard no capture buzz or something like that.  It sometimes flew for a few seconds just to land on another spot. It once flew and started calling at the other side of the building - for a short period. 
(I collected fresh droppings right underneath the spot were he was hanging, so maybe DNA-analyses will tell us more.

0829 233419 Bat Stationary Calls

Bat Calls Stretched

59899A7F

Time-expanded samples of Brazilian free-tailed bats (Tadarida brasilensis) recorded in San Francisco, California.  The first file, Kim's bats, is a compilation of different recordings including social calls and feeding buzzes near a roost in the city.  The others were recorded there or in different city parks.  All recordings were made with Pettersson D240X detectors.

Kimsbats

These are are a few sample recording from a custom made device called AudioMoth. The device is capable of recording sounds from the audible to ultrasonic frequencies. To find out more click the AudioMoth link below.

59899A7F

Open Acoustic Devices

Related tracks