HBM143: Laughing Rats and Dawn Rituals

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Image by Jeff Emtman. Photo of sage grouse by Bob Wick of the Bureau of Land Management. Orange sky elements are the spectrogram of the sound of the mouse courtship call heard in this episode.

Image by Jeff Emtman. Photo of sage grouse by Bob Wick of the Bureau of Land Management. Orange sky elements are the spectrogram of the sound of the mouse courtship call heard in this episode.

 

Animals sometimes make noises that would be impossible to place without context.  In this episode, three types of animal vocalizations—described by the people who recorded them. 

The monkey who lost their mother. Photo by Stephanie Foden.

Ashley Ahearn: Journalist and producer of Grouse, from Birdnote and Boise State Public Radio

Joel Balsam: Journalist and producer of the upcoming podcast Parallel Lives.  Joel co-created a photo essay for ESPN about the “pororoca”, an Amazonian wave chased each year by surfers. 

Kevin Coffey, Ph.D.: Co-creator of DeepSqueak and researcher at VA Puget Sound and the University of Washington.  Kevin co-authored the paper DeepSqueak: a deep learning-based system for detection and analysis of ultrasonic vocalizations in Nature’s Neuropsychopharmacology journal. 

Also heard: calls of the Indies Short Tailed Cricket (Anurogryllus celerinictus), which may be the perpetrator of the so-called “sonic attacks” recently reported in Cuba.  Sound sent in by HBM listener Isaul in Puerto Rico.  

Producer: Jeff Emtman
Music: The Black Spot

 
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Look, it’s Kane!

HBM109: Untitled Noises of New York (Sound Matters)

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Central Park in New York City. Graphic by Jeff Emtman.

 

HBM host Jeff Emtman travels to New York City in an effort to fulfill open-ended recording assignments issued from afar by Tim Hinman for an episode of Bang & Olufsen’s Sound Matters podcast.  

It should be noted that in this episode, Tim incorrectly states that Jeff is from the “lentil capital of Washington State.” In fact, Jeff is from the self-proclaimed lentil capital of the world.

This episode was produced and scored by Tim Hinman.  Tim also hosts the fantastic podcast Third Ear.

Read an interview with Jeff about the creation of HBM over on Bang and Olufsen’s blog.  Interview by Nathaniel Budzinski.

Producer: Jeff Emtman
Editor: Tim Hinman
Music: Tim Hinman

 

January ice on the Hudson. Video by Jeff Emtman.

HBM095: The Bats that Stay

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Illustration by Jeff Emtman

 

Not all migratory bats migrate.  We don’t know why some choose to stay behind at their summer roosts.  But according to the University of Washington’s Sharlene Santana, the bats that stay tend to die.  

Content Note: Fleeting language

In this episode, HBM host Jeff Emtman attempts to make a metaphor about bats and humans.  Perhaps it’s anthropomorphic, perhaps it’s unnecessarily poetic, or perhaps it’s a fair one.  

Jeff leaves his home in Seattle to move cross-country to Boston.  Along the way he takes a five day layover in Colorado to meet up with an old friend (Helen Katich) and her girlfriend (Laura Goldhamer).  The three drive from Denver to the San Luis Valley of Central Colorado.  They visit Valley View Hot Springs and walk to the mouth of an abandoned iron mine 10,000 feet above sea level called “The Glory Hole.”  

 
 

The Glory Hole houses an estimated 250,000 Mexican free-tailed bats each summer.  These bats migrate in from Central and South America to eat bugs and raise their pups.  They fly together at dusk in gatherings visually similar to the murmurations of starlings.   This bat species, also known as the Brazilian free-tailed bat, is extremely social, and perhaps nature’s most gregarious mammal species.  

Despite this, their social and hunting calls are completely inaudible to humans.  They produce ultrasounds, sounds too high pitched for human ears. But some audio equipment (see below) can still record these sounds, then computer algorithms can pitch them down into human-audible sounds.  

 
Helen Katich

Helen Katich

A preserved Mexican free-tailed bat at the welcome center of Valley View Hot Springs

 

One evening, Jeff and Helen and Laura hike to the mouth of the mine.  At this vantage point, they watch some of the bats flying out and Jeff manages to record some of their loud, ultrasonic vocalizations, before the storm forces them back downhill.  The next day, Jeff flies to his new home in Boston.

Jeff recorded the bat calls in this episode with a Tascam DR100MK3 at 192kHZ sample rate and an Echo Meter Touch 2 Pro at sample rates of 256kHZ and 384kHZ.  The calls were recorded at frequencies of approximately 21kHZ to 36kHZ and time/pitch-shifted with Elastique 3.2.3 Pro.

Producer: Jeff Emtman
Editor: Bethany Denton
Music: The Black Spot and Laura Goldhamer