Boidnoise

Various nature recordings by Bernhard Kroeger

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  • In the western foothills of the Sierra Nevada one can hear bird songs consisting of trills starting in early spring.  To a beginner these trills can be hard to distinguish.  There are four principle trillers that can be encountered in  our area which centers around Grass Valley and Nevada City, California. Except for the chipping sparrow, these birds are common in this area.  The chipping sparrows can be heard for a short time as they move through the foothills to higher elevations.

    Dark-eyed Junco

    A single element of a dark-eyed junco trill, when expanded greatly, actually consists of three phrases.  These elements are repeated at ~ 11/sec to form the trill we  hear.  There are about 10 trills/minute.

    What to listen for:  Each trill tends to stays on the same note.  It does not get higher or lower in  pitch.  It is also cut off sharply.

    Here is one minute of audio.

    Audio clip: Adobe Flash Player (version 9 or above) is required to play this audio clip. Download the latest version here. You also need to have JavaScript enabled in your browser.

    Here is audio of just two trills, followed by a sonogram of them.  The sonograms can be viewed full size by double cklicking them.

    Audio clip: Adobe Flash Player (version 9 or above) is required to play this audio clip. Download the latest version here. You also need to have JavaScript enabled in your browser.

    Sonogram of 2 Dark-eyed Junco trills

    Orange-crowned Warbler

    The trill elements are repeated at ~19/sec, and there are between 4-5 trills per minute.

    What to listen for:  Each trill begins with a rising pitch which drops and tapers off as if the bird ran out of breath.

    Here is ~ 1 minute of  audio.

    Audio clip: Adobe Flash Player (version 9 or above) is required to play this audio clip. Download the latest version here. You also need to have JavaScript enabled in your browser.

    Here is audio of just two trills, followed by a sonogram of them.

    Audio clip: Adobe Flash Player (version 9 or above) is required to play this audio clip. Download the latest version here. You also need to have JavaScript enabled in your browser.

    Sonogram of 2 Orange-crowned Warbler  trills

    Sonogram of 2 Orange-crowned Warbler trills

    Spotted Towhee

    A single element of a spotted towhee trill consists of five distinct elements; a held note followed by 4 shorter and louder notes.  These elements are repeated ~18/sec for a single trill.  Trills are repeated 10-16/minute.

    What to listen for:  Each trill is preceded by a very short low note which is slurred to a high note followed by the trill in one smooth and quick sequence. The lead-in slur can be missed at times and only the trill is heard.  After the initial slur the trill tends to remain on a single note.

    Here is one minute of audio.

    Audio clip: Adobe Flash Player (version 9 or above) is required to play this audio clip. Download the latest version here. You also need to have JavaScript enabled in your browser.

    Here is audio of just two trills, followed by a sonogram of them.

    Audio clip: Adobe Flash Player (version 9 or above) is required to play this audio clip. Download the latest version here. You also need to have JavaScript enabled in your browser.

    Sonogram of 2 Spotted Towhee trills

    Sonogram of 2 Spotted Towhee trills

    Chipping Sparrow

    The elements of a Chipping Sparrow trill consist of single notes ~31/sec or ~11 trills/minute with variable intervals between trills.

    What to listen for:  The trills are very rapid and tend to build in volume before being cut off sharply.  The length of each trill tends to be variable in length.  Some birders ascribe a more mechanical or insect-like quality to this triller.

    Here is one minute of audio.

    Audio clip: Adobe Flash Player (version 9 or above) is required to play this audio clip. Download the latest version here. You also need to have JavaScript enabled in your browser.

    Here is audio of just two trills, followed by a sonogram of them.

    Audio clip: Adobe Flash Player (version 9 or above) is required to play this audio clip. Download the latest version here. You also need to have JavaScript enabled in your browser.

    Sonogram of 2 Chipping Sparrow trills

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