Hi Marc,
I measure a fundamental of, on average, around 40 Hz in your Southern Casso=
wary's call. Given that the fundamental is the strongest harmonic in this c=
all, except at the end where it goes down to 20-25 Hz, that is indeed *very=
* low for a vocalization. Near-infrasound.
I hadn't heard of such low vocalizations in birds, but it turns out it has =
been described already:
Title: Low-frequency vocalizations by cassowaries (Casuarius spp.)
Author(s): Mack, AL; Jones, J
Source: AUK Volume: 120 Issue: 4 Pages: 1062-1068 DOI: 10.1642/0004-=
8038(2003)120[1062:LVBCCS]2.0.CO;2 Published: OCT 2003
If you are interested and don't have access to Auk, I can send the pdf to y=
ou.
If there are people that know of avian vocalizations below 40 Hz, I'd also =
be very interested in hearing about it.
Best, Gabriel
--- In "wildambience" <> wrote:
>
> The Southern Cassowary's call is apparently the lowest frequency known so=
und from any bird (if you can think of another contender I'd be interested =
to hear about it).
>
> I recorded this sample from a captive bird in a wildlife park near Sydney=
, Australia - all I had on hand was my Canon DSLR and this is the resulting=
audio file, not great but I was happy that the miniature mic even picked i=
t up. Would love to record it again with some decent gear if I get the chan=
ce!
>
> https://soundcloud.com/wildambience/southern-cassowary-casuarius
>
> Hearing the call close up is incredible - sounds more like an large mamma=
l than a bird!
>
> Marc Anderson
> http://wildambience.com
>
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